Skip to main content

Home/ TOK Friends/ Group items tagged electron

Rss Feed Group items tagged

Filter: All | Bookmarks | Topics Simple Middle
carolinewren

Researchers at Brown University shattered an electron wave function | Motherboard - 1 views

motherboard.vice.com/...eirder-shattered-wavefunctions

knowledge electron researchers

shared by carolinewren on 27 Feb 15 - No Cached
  • When we say some element of the quantum world occupies many states at once, what’s really being referred to is the element’s wave function. A wave function can be viewed as a space occupied simultaneously by many different possibilities or degrees of freedom.
  • Even what we’d normally (deterministically) consider empty space has a wave function and, as such, contains very real possibilities of not being empty.
  • Visually, we might imagine a particle in its undisturbed state looking more like a cloud than a point in space.
  • ...15 more annotations...
  • a bunch of particles can share these states at the same time, effectively becoming instances of the same particle. And so: entanglement.
  • possible to strip away all of this indeterminateness
  • wave functions are very fragile, subject to a “collapse” in which all of those possibilities become just a single particle at a single point at a single time.
  • physicists have observed a very peculiar behavior of electrons in supercooled baths of helium. When an electron enters the bath, it acts to
  • two probabilities can be isolated from each other, cordoned off like quantum crime scenes
  • it’s possible to take a wave function and isolate it into different parts. So, if our electron has some probability of being in position (x1,y1,z1) and another probability of being in position (x2,y2,z2), those two probabilities can be isolated from each other, cordoned off like quantum crime scenes
  • when a macroscopic human attempts to measure a quantum mechanical system: The wave drops away and all that’s left is a boring, well-defined thing.
  • trapping the chance of finding the electron, not pieces of the electron
  • using tiny bubbles of helium as physical “traps.
  • repel the surrounding helium atoms, forming its own little bubble or cavity in the process.
  • That an electron (or other particle) can be in many places at the same time is strange enough, but the notion that those possibilities can be captured and shuttled away adds a whole new twist.
  • wave function isn’t a physical thing. It’s mathematics that describe a phenomenon.
  • The electron, upon measurement, will be in precisely one bubble.
  • “No one is sure what actually constitutes a measurement,”
  • Is consciousness required? We don’t really know.”
carolinewren

The Reality of Quantum Weirdness - NYTimes.com - 2 views

www.nytimes.com/...lity-of-quantum-weirdness.html

quantum reality nytimes science

shared by carolinewren on 27 Feb 15 - No Cached
  • Is there a true story, or is our belief in a definite, objective, observer-independent reality an illusion?
  • Is there a fixed reality apart from our various observations of it? Or is reality nothing more than a kaleidoscope of infinite possibilities?
  • So an electron is a wave, not a particle?
  • ...7 more annotations...
  • each electron somehow acts like a wave interfering with itself, as if it is simultaneously passing through both slits at once.
  • Instead, we see two lumps on the screen, as if the electrons, suddenly aware of being observed, decided to act like little pellets.
  • the electrons go back to their wavelike behavior, and the interference pattern miraculously reappears.
  • . For an individual particle like an electron, for example, the wave function provides information about the probabilities that the particle can be observed at particular locations, as well as the probabilities of the results of other measurements of the particle that you can make, such as measuring its momentum.
  • If the wave function is merely knowledge-based, then you can explain away odd quantum phenomena by saying that things appear to us this way only because our knowledge of the real state of affairs is insufficient.
  • If there is an objective reality at all, the paper demonstrates, then the wave function is in fact reality-based.
  • We should be careful to recognize that the weirdness of the quantum world does not directly imply the same kind of weirdness in the world of everyday experience. That’s because the nebulous quantum essence of individual elementary particles is known to quickly dissipate in large ensembles of particles (a phenomenon often referred to as “decoherence”).
runlai_jiang

Reactivity Definition in Chemistry - 0 views

www.thoughtco.com/reactivity-definition-4147073

shared by runlai_jiang on 15 Jan 18 - No Cached
  • In chemistry, reactivity is a measure of how readily a substance undergoes a chemical reaction. The reaction can involve the substance on its own or with other atoms or compounds, generally accompanied by a release of energy. The most reactive elements and compounds may ignite spontaneously or explosively. They generally burn in water as well as the oxygen in air. Reactivity is dependent upon temperature.
  • Reactivity Trend in the Periodic TableThe organization of elements on the periodic table allows for predictions concerning reactivity. Both highly electropositive and highly electronegative elements have a strong tendency to react. These elements are located in the upper right and lower left corners of the periodic table and in certain element groups. The halogens, alkali metals, and alkaline earth metals are highly reactive.
  • How Reactivity WorksA substance reacts when the products formed from a chemical reaction have a lower energy (higher stability) than the reactants. The energy difference can be predicted using valence bond theory, atomic orbital theory, and molecular orbital theory. Basically, it boils down to the stability of electrons in their orbitals. Unpaired electrons with no electrons in comparable orbitals are the most likely to interact with orbitals from other atoms, forming chemical bonds. Unpaired electrons with degenerate orbitals that are half-filled are more stable, but still reactive. The least reactive atoms are those with a filled set of orbitals (octet).
  • ...1 more annotation...
  • Stability Versus ReactivitySometimes a species with low reactivity is called "stable", but care should be taken to make the context clear. Stability can also refer to slow radioactive decay or to the transition of electrons from the excited state to less energetic levels (as in luminescence). A nonreactive species may be called "inert". However, most inert species actually do react under the right conditions to form complexes and compounds (e.g., higher atomic number noble gases).
Javier E

Have Smartphones Destroyed a Generation? - The Atlantic - 0 views

www.theatlantic.com/...534198

smartphone generation social media psychology teen

shared by Javier E on 03 Aug 17 - No Cached
  • She told me she’d spent most of the summer hanging out alone in her room with her phone. That’s just the way her generation is, she said. “We didn’t have a choice to know any life without iPads or iPhones. I think we like our phones more than we like actual people.”
  • The arrival of the smartphone has radically changed every aspect of teenagers’ lives, from the nature of their social interactions to their mental health. These changes have affected young people in every corner of the nation and in every type of household
  • Around 2012, I noticed abrupt shifts in teen behaviors and emotional states. The gentle slopes of the line graphs became steep mountains and sheer cliffs, and many of the distinctive characteristics of the Millennial generation began to disappear. In all my analyses of generational data—some reaching back to the 1930s—I had never seen anything like it.
  • ...54 more annotations...
  • the trends persisted, across several years and a series of national surveys. The changes weren’t just in degree, but in kind.
  • The biggest difference between the Millennials and their predecessors was in how they viewed the world; teens today differ from the Millennials not just in their views but in how they spend their time. The experiences they have every day are radically different from those of the generation that came of age just a few years before them.
  • it was exactly the moment when the proportion of Americans who owned a smartphone surpassed 50 percent.
  • theirs is a generation shaped by the smartphone and by the concomitant rise of social media. I call them iGen
  • Born between 1995 and 2012, members of this generation are growing up with smartphones, have an Instagram account before they start high school, and do not remember a time before the internet.
  • iGen’s oldest members were early adolescents when the iPhone was introduced, in 2007, and high-school students when the iPad entered the scene, in 2010. A 2017 survey of more than 5,000 American teens found that three out of four owned an iPhone.
  • . I had grown accustomed to line graphs of trends that looked like modest hills and valleys. Then I began studying Athena’s generation.
  • More comfortable in their bedrooms than in a car or at a party, today’s teens are physically safer than teens have ever been. They’re markedly less likely to get into a car accident and, having less of a taste for alcohol than their predecessors, are less susceptible to drinking’s attendant ills.
  • Psychologically, however, they are more vulnerable than Millennials were: Rates of teen depression and suicide have skyrocketed since 2011. It’s not an exaggeration to describe iGen as being on the brink of the worst mental-health crisis in decades. Much of this deterioration can be traced to their phones.
  • the twin rise of the smartphone and social media has caused an earthquake of a magnitude we’ve not seen in a very long time, if ever. There is compelling evidence that the devices we’ve placed in young people’s hands are having profound effects on their lives—and making them seriously unhappy.
  • But the allure of independence, so powerful to previous generations, holds less sway over today’s teens, who are less likely to leave the house without their parents. The shift is stunning: 12th-graders in 2015 were going out less often than eighth-graders did as recently as 2009.
  • Today’s teens are also less likely to date. The initial stage of courtship, which Gen Xers called “liking” (as in “Ooh, he likes you!”), kids now call “talking”—an ironic choice for a generation that prefers texting to actual conversation. After two teens have “talked” for a while, they might start dating.
  • only about 56 percent of high-school seniors in 2015 went out on dates; for Boomers and Gen Xers, the number was about 85 percent.
  • The decline in dating tracks with a decline in sexual activity. The drop is the sharpest for ninth-graders, among whom the number of sexually active teens has been cut by almost 40 percent since 1991. The average teen now has had sex for the first time by the spring of 11th grade, a full year later than the average Gen Xer
  • The teen birth rate hit an all-time low in 2016, down 67 percent since its modern peak, in 1991.
  • Nearly all Boomer high-school students had their driver’s license by the spring of their senior year; more than one in four teens today still lack one at the end of high school.
  • In conversation after conversation, teens described getting their license as something to be nagged into by their parents—a notion that would have been unthinkable to previous generations.
  • In the late 1970s, 77 percent of high-school seniors worked for pay during the school year; by the mid-2010s, only 55 percent did. The number of eighth-graders who work for pay has been cut in half.
  • Beginning with Millennials and continuing with iGen, adolescence is contracting again—but only because its onset is being delayed. Across a range of behaviors—drinking, dating, spending time unsupervised— 18-year-olds now act more like 15-year-olds used to, and 15-year-olds more like 13-year-olds. Childhood now stretches well into high school.
  • In an information economy that rewards higher education more than early work history, parents may be inclined to encourage their kids to stay home and study rather than to get a part-time job. Teens, in turn, seem to be content with this homebody arrangement—not because they’re so studious, but because their social life is lived on their phone. They don’t need to leave home to spend time with their friends.
  • eighth-, 10th-, and 12th-graders in the 2010s actually spend less time on homework than Gen X teens did in the early 1990s.
  • The time that seniors spend on activities such as student clubs and sports and exercise has changed little in recent years. Combined with the decline in working for pay, this means iGen teens have more leisure time than Gen X teens did, not less.
  • So what are they doing with all that time? They are on their phone, in their room, alone and often distressed.
  • despite spending far more time under the same roof as their parents, today’s teens can hardly be said to be closer to their mothers and fathers than their predecessors were. “I’ve seen my friends with their families—they don’t talk to them,” Athena told me. “They just say ‘Okay, okay, whatever’ while they’re on their phones. They don’t pay attention to their family.” Like her peers, Athena is an expert at tuning out her parents so she can focus on her phone.
  • The number of teens who get together with their friends nearly every day dropped by more than 40 percent from 2000 to 2015; the decline has been especially steep recently.
  • Eighth-graders who are heavy users of social media increase their risk of depression by 27 percent, while those who play sports, go to religious services, or even do homework more than the average teen cut their risk significantly.
  • The roller rink, the basketball court, the town pool, the local necking spot—they’ve all been replaced by virtual spaces accessed through apps and the web.
  • The results could not be clearer: Teens who spend more time than average on screen activities are more likely to be unhappy, and those who spend more time than average on nonscreen activities are more likely to be happy.
  • There’s not a single exception. All screen activities are linked to less happiness, and all nonscreen activities are linked to more happiness
  • Eighth-graders who spend 10 or more hours a week on social media are 56 percent more likely to say they’re unhappy than those who devote less time to social media
  • If you were going to give advice for a happy adolescence based on this survey, it would be straightforward: Put down the phone, turn off the laptop, and do something—anything—that does not involve a screen
  • Social-networking sites like Facebook promise to connect us to friends. But the portrait of iGen teens emerging from the data is one of a lonely, dislocated generation. Teens who visit social-networking sites every day but see their friends in person less frequently are the most likely to agree with the statements “A lot of times I feel lonely,” “I often feel left out of things,” and “I often wish I had more good friends.” Teens’ feelings of loneliness spiked in 2013 and have remained high since.
  • This doesn’t always mean that, on an individual level, kids who spend more time online are lonelier than kids who spend less time online.
  • Teens who spend more time on social media also spend more time with their friends in person, on average—highly social teens are more social in both venues, and less social teens are less so.
  • The more time teens spend looking at screens, the more likely they are to report symptoms of depression.
  • It’s not only a matter of fewer kids partying; fewer kids are spending time simply hanging out
  • Teens who spend three hours a day or more on electronic devices are 35 percent more likely to have a risk factor for suicide, such as making a suicide plan. (That’s much more than the risk related to, say, watching TV.)
  • Since 2007, the homicide rate among teens has declined, but the suicide rate has increased. As teens have started spending less time together, they have become less likely to kill one another, and more likely to kill themselves. In 2011, for the first time in 24 years, the teen suicide rate was higher than the teen homicide rate.
  • For all their power to link kids day and night, social media also exacerbate the age-old teen concern about being left out.
  • Today’s teens may go to fewer parties and spend less time together in person, but when they do congregate, they document their hangouts relentlessly—on Snapchat, Instagram, Facebook. Those not invited to come along are keenly aware of it. Accordingly, the number of teens who feel left out has reached all-time highs across age groups.
  • Forty-eight percent more girls said they often felt left out in 2015 than in 2010, compared with 27 percent more boys. Girls use social media more often, giving them additional opportunities to feel excluded and lonely when they see their friends or classmates getting together without them.
  • Social media levy a psychic tax on the teen doing the posting as well, as she anxiously awaits the affirmation of comments and likes. When Athena posts pictures to Instagram, she told me, “I’m nervous about what people think and are going to say. It sometimes bugs me when I don’t get a certain amount of likes on a picture.”
  • Girls have also borne the brunt of the rise in depressive symptoms among today’s teens. Boys’ depressive symptoms increased by 21 percent from 2012 to 2015, while girls’ increased by 50 percent—more than twice as much
  • The rise in suicide, too, is more pronounced among girls. Although the rate increased for both sexes, three times as many 12-to-14-year-old girls killed themselves in 2015 as in 2007, compared with twice as many boys
  • Social media give middle- and high-school girls a platform on which to carry out the style of aggression they favor, ostracizing and excluding other girls around the clock.
  • I asked my undergraduate students at San Diego State University what they do with their phone while they sleep. Their answers were a profile in obsession. Nearly all slept with their phone, putting it under their pillow, on the mattress, or at the very least within arm’s reach of the bed. They checked social media right before they went to sleep, and reached for their phone as soon as they woke up in the morning
  • the smartphone is cutting into teens’ sleep: Many now sleep less than seven hours most nights. Sleep experts say that teens should get about nine hours of sleep a night; a teen who is getting less than seven hours a night is significantly sleep deprived
  • Fifty-seven percent more teens were sleep deprived in 2015 than in 1991. In just the four years from 2012 to 2015, 22 percent more teens failed to get seven hours of sleep.
  • Two national surveys show that teens who spend three or more hours a day on electronic devices are 28 percent more likely to get less than seven hours of sleep than those who spend fewer than three hours, and teens who visit social-media sites every day are 19 percent more likely to be sleep deprived.
  • Teens who read books and magazines more often than the average are actually slightly less likely to be sleep deprived—either reading lulls them to sleep, or they can put the book down at bedtime.
  • Sleep deprivation is linked to myriad issues, including compromised thinking and reasoning, susceptibility to illness, weight gain, and high blood pressure. It also affects mood: People who don’t sleep enough are prone to depression and anxiety.
  • correlations between depression and smartphone use are strong enough to suggest that more parents should be telling their kids to put down their phone.
  • What’s at stake isn’t just how kids experience adolescence. The constant presence of smartphones is likely to affect them well into adulthood. Among people who suffer an episode of depression, at least half become depressed again later in life. Adolescence is a key time for developing social skills; as teens spend less time with their friends face-to-face, they have fewer opportunities to practice them
  • Significant effects on both mental health and sleep time appear after two or more hours a day on electronic devices. The average teen spends about two and a half hours a day on electronic devices. Some mild boundary-setting could keep kids from falling into harmful habits.
Javier E

Seeking Dark Matter, They Detected Another Mystery - The New York Times - 0 views

www.nytimes.com/...-axions-neutrinos-tritium.html

dark matter physics research science

shared by Javier E on 01 Jul 20 - No Cached
  • A team of scientists hunting dark matter has recorded suspicious pings coming from a vat of liquid xenon underneath a mountain in Italy
  • If the signal is real and persists, the scientists say, it may be evidence of a species of subatomic particles called axions — long theorized to play a crucial role in keeping nature symmetrical but never seen — streaming from the sun.
  • Instead of axions, the scientists may have detected a new, unexpected property of the slippery ghostly particles called neutrinos. Yet another equally likely explanation is that their detector has been contaminated by vanishingly tiny amounts of tritium, a rare radioactive form of hydrogen.
  • ...19 more annotations...
  • “We want to be very clear that all we are reporting is observation of an excess (a fairly significant one) and not a discovery of any kind,”
  • “I’m trying to be calm here, but it’s hard not to be hyperbolic,” said Neal Weiner, a particle theorist at New York University. “If this is real, calling it a game changer would be an understatement.”
  • Dr. Aprile’s Xenon experiment is currently the largest and most sensitive in an alphabet soup of efforts aimed at detecting and identifying dark matter
  • The best guess is that this dark matter consists of clouds of exotic subatomic particles left over from the Big Bang and known generically as WIMPs, for weakly interacting massive particles, hundreds or thousands of times more massive than a hydrogen atom.
  • The story of axions begins in 1977, when Roberto Peccei, a professor at the University of California, Los Angeles, who died on June 1, and Helen Quinn, emerita professor at Stanford, suggested a slight modification to the theory that governs strong nuclear forces, making sure that it is invariant to the direction of time, a feature that physicists consider a necessity for the universe.
  • in its most recent analysis of that experiment, the team had looked for electrons, rather than the heavier xenon nuclei, recoiling from collisions. Among other things, that could be the signature of particles much lighter than the putative WIMPs striking the xenon.
  • Simulations and calculations suggested that random events should have produced about 232 such recoils over the course of a year.
  • But from February 2017 to February 2018, the detector recorded 285, an excess of 53 recoils.
  • Dr. Aprile and her colleagues have wired a succession of vats containing liquid xenon with photomultipliers and other sensors. The hope is that her team’s device — far underground to shield it from cosmic rays and other worldly forms of interference — would spot the rare collision between a WIMP and a xenon atom. The collision should result in a flash of light and a cloud of electrical charge.
  • this modification implied the existence of a new subatomic particle. Dr. Wilczek called it the axion, and the name stuck.
  • Axions have never been detected either directly or indirectly. And the theory does not predict their mass, which makes it hard to look for them. It only predicts that they would be weird and would barely interact with regular matter
  • although they are not WIMPS, they share some of those particles’ imagined weird abilities, such as being able to float through Earth and our bodies like smoke through a screen door.
  • In order to fulfill the requirements of cosmologists, however, such dark-matter axions would need to have a mass of less than a thousandth of an electron volt in the units of mass and energy preferred by physicists
  • (By comparison, the electrons that dance around in your smartphone weigh in at half a million electron volts each.) What they lack in heft they would more than make up for in numbers.
  • That would make individual cosmic dark-matter axions too slow and ethereal to be detected by the Xenon experiment.But axions could also be produced by nuclear reactions in the sun, and those “solar axions” would have enough energy to ping the Xenon detector right where it is most sensitive
  • The other exciting, though slightly less likely, possibility is that the Xenon collaboration’s excess signals come from the wispy particles known as neutrinos, which are real, and weird, and zipping through our bodies by the trillions every second.
  • Ordinarily, these neutrinos would not contribute much to the excess of events the detector read. But they would do so if they had an intrinsic magnetism that physicists call a magnetic moment. That would give them a higher probability of interacting with the xenon and tripping the detector
  • According to the standard lore, neutrinos, which are electrically neutral, do not carry magnetism. The discovery that they did would require rewriting the rules as they apply to neutrinos.
  • That, said Dr. Weiner, would be “a very very big deal,” because it would imply that there are new fundamental particles out there to look for — new physics.
Javier E

Physicists in Europe Find Tantalizing Hints of a Mysterious New Particle - The New York... - 0 views

www.nytimes.com/...a-mysterious-new-particle.html

physics discovery particle research science

shared by Javier E on 17 Dec 15 - No Cached
  • Two teams of physicists working independently at the Large Hadron Collider at CERN, the European Organization for Nuclear Research, reported on Tuesday that they had seen traces of what could be a new fundamental particle of nature.
  • One possibility, out of a gaggle of wild and not-so-wild ideas springing to life as the day went on, is that the particle — assuming it is real — is a heavier version of the Higgs boson, a particle that explains why other particles have mass. Another is that it is a graviton, the supposed quantum carrier of gravity, whose discovery could imply the existence of extra dimensions of space-time.
  • At the end of a long chain of “ifs” could be a revolution, the first clues to a theory of nature that goes beyond the so-called Standard Model, which has ruled physics for the last quarter-century.
  • ...8 more annotations...
  • The Higgs boson was the last missing piece of the Standard Model, which explains all we know about subatomic particles and forces. But there are questions this model does not answer, such as what happens at the bottom of a black hole, the identity of the dark matter and dark energy that rule the cosmos, or why the universe is matter and not antimatter.
  • When physicists announced in 2012 that they had indeed discovered the Higgs boson, it was not the end of physics. It was not even, to paraphrase Winston Churchill, the beginning of the end.
  • A coincidence is the most probable explanation for the surprising bumps in data from the collider, physicists from the experiments cautioned, saying that a lot more data was needed and would in fact soon be available
  • The Large Hadron Collider was built at a cost of some $10 billion, to speed protons around an 18-mile underground track at more than 99 percent of the speed of light and smash them together in search of new particles and forces of nature. By virtue of Einstein’s equivalence of mass and energy, the more energy poured into these collisions, the more massive particles can come out of them. And by the logic of quantum microscopy, the more energy they have to spend, the smaller and more intimate details of nature physicists can see.
  • Since June, after a two-year shutdown, CERN physicists have been running their collider at nearly twice the energy with which they discovered the Higgs, firing twin beams of protons with 6.5 trillion electron volts of energy at each other in search of new particles to help point them to deeper laws.
  • The most intriguing result so far, reported on Tuesday, is an excess of pairs of gamma rays corresponding to an energy of about 750 billion electron volts. The gamma rays, the physicists said, could be produced by the radioactive decay of a new particle, in this case perhaps a cousin of the Higgs boson, which itself was first noticed because it decayed into an abundance of gamma rays.
  • Or it could be a more massive particle that has decayed in steps down to a pair of photons. Nobody knows. No model predicted this, which is how some scientists like it.
  • “We are barely coming to terms with the power and the glory” of the CERN collider’s ability to operate at 13 trillion electron volts, Dr. Spiropulu said in a text message. “We are now entering the era of taking a shot in the dark!”
jlessner

The case against e-readers: Why reading paper books is better for your mind. - The Wash... - 0 views

www.washingtonpost.com/...-better-for-your-mind-and-body

brain science paper books mind psychology knowledge education Technology science Research

shared by jlessner on 18 Jan 15 - No Cached
  • We know a lot about the pros and cons of reading a hard-copy book vs. reading electronically. The problem is, many of us refuse to listen.
  • Ask people what they like most about reading on digital screens (a question I’ve put to several hundred university students in the United States, Germany, Japan and Slovakia), and you hear over and again about convenience: “easy to carry” and “compact.”
  • Yet the soundness of this case is arguable. The earth metals we’re using up to build e-readers and tablets are not just rare but highly toxic. And think about all that energy needed to run servers and cooling fans. And remember, trees are a renewable resource.
  • ...3 more annotations...
  • prefer print when reading both for pleasure and for school or work.
  • But the real nail in the coffin for one-size-fits-all electronic reading is concentration. Over 92 percent of those I surveyed said they concentrate best when reading a hard copy. The explanation is hardly rocket science. When a digital device has an Internet connection, it’s hard to resist the temptation to jump ship: I’ll just respond to that text I heard come in, check the headlines, order those boots that are on sale.
  • Readers are human. If you dangle distractions in front of us (or if we know they are just a click or swipe away), it’s hard not to take the bait.
Javier E

The Reality of Quantum Weirdness - NYTimes.com - 1 views

www.nytimes.com/...lity-of-quantum-weirdness.html

reality quantum objectivism science physics

shared by Javier E on 21 Feb 15 - No Cached
  • Is there a true story, or is our belief in a definite, objective, observer-independent reality an illusion?
  • a paper published online in the journal Nature Physics presents experimental research that supports the latter scenario — that there is a “Rashomon effect” not just in our descriptions of nature, but in nature itself.
  • The electron appears to be a strange hybrid of a wave and a particle that’s neither here and there nor here or there. Like a well-trained actor, it plays the role it’s been called to perform
  • ...8 more annotations...
  • Is nature really this weird? Or is this apparent weirdness just a reflection of our imperfect knowledge of nature?
  • The answer depends on how you interpret the equations of quantum mechanics, the mathematical theory that has been developed to describe the interactions of elementary particles. The success of this theory is unparalleled: Its predictions, no matter how “spooky,” have been observed and verified with stunning precision. It has also been the basis of remarkable technological advances. So it is a powerful tool. But is it also a picture of reality?
  • Does the wave function directly correspond to an objective, observer-independent physical reality, or does it simply represent an observer’s partial knowledge of it?
  • If there is an objective reality at all, the paper demonstrates, then the wave function is in fact reality-based.
  • What this research implies is that we are not just hearing different “stories” about the electron, one of which may be true. Rather, there is one true story, but it has many facets, seemingly in contradiction, just like in “Rashomon.” There is really no escape from the mysterious — some might say, mystical — nature of the quantum world.
  • We should be careful to recognize that the weirdness of the quantum world does not directly imply the same kind of weirdness in the world of everyday experience.
  • This is why, in fact, we are able to describe the objects around us in the language of classical physics.
  • I suggest that we regard the paradoxes of quantum physics as a metaphor for the unknown infinite possibilities of our own existence.
Javier E

What Does Quantum Physics Actually Tell Us About the World? - The New York Times - 2 views

www.nytimes.com/...adam-becker-what-is-real.html

quantum physics theory reality science ontological

shared by Javier E on 11 May 18 - No Cached
  • The physics of atoms and their ever-smaller constituents and cousins is, as Adam Becker reminds us more than once in his new book, “What Is Real?,” “the most successful theory in all of science.” Its predictions are stunningly accurate, and its power to grasp the unseen ultramicroscopic world has brought us modern marvels.
  • But there is a problem: Quantum theory is, in a profound way, weird. It defies our common-sense intuition about what things are and what they can do.
  • Indeed, Heisenberg said that quantum particles “are not as real; they form a world of potentialities or possibilities rather than one of things or facts.”
  • ...19 more annotations...
  • Before he died, Richard Feynman, who understood quantum theory as well as anyone, said, “I still get nervous with it...I cannot define the real problem, therefore I suspect there’s no real problem, but I’m not sure there’s no real problem.” The problem is not with using the theory — making calculations, applying it to engineering tasks — but in understanding what it means. What does it tell us about the world?
  • From one point of view, quantum physics is just a set of formalisms, a useful tool kit. Want to make better lasers or transistors or television sets? The Schrödinger equation is your friend. The trouble starts only when you step back and ask whether the entities implied by the equation can really exist. Then you encounter problems that can be described in several familiar ways:
  • Wave-particle duality. Everything there is — all matter and energy, all known forces — behaves sometimes like waves, smooth and continuous, and sometimes like particles, rat-a-tat-tat. Electricity flows through wires, like a fluid, or flies through a vacuum as a volley of individual electrons. Can it be both things at once?
  • The uncertainty principle. Werner Heisenberg famously discovered that when you measure the position (let’s say) of an electron as precisely as you can, you find yourself more and more in the dark about its momentum. And vice versa. You can pin down one or the other but not both.
  • The measurement problem. Most of quantum mechanics deals with probabilities rather than certainties. A particle has a probability of appearing in a certain place. An unstable atom has a probability of decaying at a certain instant. But when a physicist goes into the laboratory and performs an experiment, there is a definite outcome. The act of measurement — observation, by someone or something — becomes an inextricable part of the theory
  • The strange implication is that the reality of the quantum world remains amorphous or indefinite until scientists start measuring
  • Other interpretations rely on “hidden variables” to account for quantities presumed to exist behind the curtain.
  • This is disturbing to philosophers as well as physicists. It led Einstein to say in 1952, “The theory reminds me a little of the system of delusions of an exceedingly intelligent paranoiac.”
  • “Figuring out what quantum physics is saying about the world has been hard,” Becker says, and this understatement motivates his book, a thorough, illuminating exploration of the most consequential controversy raging in modern science.
  • In a way, the Copenhagen is an anti-interpretation. “It is wrong to think that the task of physics is to find out how nature is,” Bohr said. “Physics concerns what we can say about nature.”
  • Nothing is definite in Bohr’s quantum world until someone observes it. Physics can help us order experience but should not be expected to provide a complete picture of reality. The popular four-word summary of the Copenhagen interpretation is: “Shut up and calculate!”
  • Becker sides with the worriers. He leads us through an impressive account of the rise of competing interpretations, grounding them in the human stories
  • He makes a convincing case that it’s wrong to imagine the Copenhagen interpretation as a single official or even coherent statement. It is, he suggests, a “strange assemblage of claims.
  • An American physicist, David Bohm, devised a radical alternative at midcentury, visualizing “pilot waves” that guide every particle, an attempt to eliminate the wave-particle duality.
  • Competing approaches to quantum foundations are called “interpretations,” and nowadays there are many. The first and still possibly foremost of these is the so-called Copenhagen interpretation.
  • Perhaps the most popular lately — certainly the most talked about — is the “many-worlds interpretation”: Every quantum event is a fork in the road, and one way to escape the difficulties is to imagine, mathematically speaking, that each fork creates a new universe
  • if you think the many-worlds idea is easily dismissed, plenty of physicists will beg to differ. They will tell you that it could explain, for example, why quantum computers (which admittedly don’t yet quite exist) could be so powerful: They would delegate the work to their alter egos in other universes.
  • When scientists search for meaning in quantum physics, they may be straying into a no-man’s-land between philosophy and religion. But they can’t help themselves. They’re only human.
  • If you were to watch me by day, you would see me sitting at my desk solving Schrödinger’s equation...exactly like my colleagues,” says Sir Anthony Leggett, a Nobel Prize winner and pioneer in superfluidity. “But occasionally at night, when the full moon is bright, I do what in the physics community is the intellectual equivalent of turning into a werewolf: I question whether quantum mechanics is the complete and ultimate truth about the physical universe.”
Javier E

Revisiting the prophetic work of Neil Postman about the media » MercatorNet - 1 views

mercatornet.com/...68239

postman media analysis social media psychology brain science technology education

shared by Javier E on 13 May 21 - No Cached
  • The NYU professor was surely prophetic. “Our own tribe is undergoing a vast and trembling shift from the magic of writing to the magic of electronics,” he cautioned.
  • “We face the rapid dissolution of the assumptions of an education organised around the slow-moving printed word, and the equally rapid emergence of a new education based on the speed-of-light electronic message.”
  • What Postman perceived in television has been dramatically intensified by smartphones and social media
  • ...31 more annotations...
  • Postman also recognised that technology was changing our mental processes and social habits.
  • Today corporations like Google and Amazon collect data on Internet users based on their browsing history, the things they purchase, and the apps they use
  • Yet all citizens are undergoing this same transformation. Our digital devices undermine social interactions by isolating us,
  • “Years from now, it will be noticed that the massive collection and speed-of-light retrieval of data have been of great value to large-scale organisations, but have solved very little of importance to most people, and have created at least as many problems for them as they may have solved.”
  • “Television has by its power to control the time, attention, and cognitive habits of our youth gained the power to control their education.”
  • As a student of Canadian philosopher Marshall McLuhan, Postman believed that the medium of information was critical to understanding its social and political effects. Every technology has its own agenda. Postman worried that the very nature of television undermined American democratic institutions.
  • Many Americans tuned in to the presidential debate looking for something substantial and meaty
  • It was simply another manifestation of the incoherence and vitriol of cable news
  • “When, in short, a people become an audience and their public business a vaudeville act, then a nation finds itself at risk; culture-death is a clear possibility,” warned Postman.
  • Technology Is Never Neutral
  • As for new problems, we have increased addictions (technological and pornographic); increased loneliness, anxiety, and distraction; and inhibited social and intellectual maturation.
  • The average length of a shot on network television is only 3.5 seconds, so that the eye never rests, always has something new to see. Moreover, television offers viewers a variety of subject matter, requires minimal skills to comprehend it, and is largely aimed at emotional gratification.
  • This is far truer of the Internet and social media, where more than a third of Americans, and almost half of young people, now get their news.
  • with smartphones now ubiquitous, the Internet has replaced television as the “background radiation of the social and intellectual universe.”
  • Is There Any Solution?
  • Reading news or commentary in print, in contrast, requires concentration, patience, and careful reflection, virtues that our digital age vitiates.
  • Politics as Entertainment
  • “How television stages the world becomes the model for how the world is properly to be staged,” observed Postman. In the case of politics, television fashions public discourse into yet another form of entertainment
  • In America, the fundamental metaphor for political discourse is the television commercial. The television commercial is not at all about the character of products to be consumed. … They tell everything about the fears, fancies, and dreams of those who might buy them.
  • The television commercial has oriented business away from making products of value and towards making consumers feel valuable, which means that the business of business has now become pseudo-therapy. The consumer is a patient assured by psycho-dramas.
  • Such is the case with the way politics is “advertised” to different subsets of the American electorate. The “consumer,” depending on his political leanings, may be manipulated by fears of either an impending white-nationalist, fascist dictatorship, or a radical, woke socialist takeover.
  • This paradigm is aggravated by the hypersiloing of media content, which explains why Americans who read left-leaning media view the Proud Boys as a legitimate, existential threat to national civil order, while those who read right-leaning media believe the real immediate enemies of our nation are Antifa
  • Regardless of whether either of these groups represents a real public menace, the loss of any national consensus over what constitutes objective news means that Americans effectively talk past one another: they use the Proud Boys or Antifa as rhetorical barbs to smear their ideological opponents as extremists.
  • Yet these technologies are far from neutral. They are, rather, “equipped with a program for social change.
  • Postman’s analysis of technology is prophetic and profound. He warned of the trivialising of our media, defined by “broken time and broken attention,” in which “facts push other facts into and then out of consciousness at speeds that neither permit nor require evaluation.” He warned of “a neighborhood of strangers and pointless quantity.”
  • does Postman offer any solutions to this seemingly uncontrollable technological juggernaut?
  • Postman’s suggestions regarding education are certainly relevant. He unequivocally condemned education that mimics entertainment, and urged a return to learning that is hierarchical, meaning that it first gives students a foundation of essential knowledge before teaching “critical thinking.”
  • Postman also argued that education must avoid a lowest-common-denominator approach in favor of complexity and the perplexing: the latter method elicits in the student a desire to make sense of what perplexes him.
  • Finally, Postman promoted education of vigorous exposition, logic, and rhetoric, all being necessary for citizenship
  • Another course of action is to understand what these media, by their very nature, do to us and to public discourse.
  • We must, as Postman exhorts us, “demystify the data” and dominate our technology, lest it dominate us. We must identify and resist how television, social media, and smartphones manipulate our emotions, infantilise us, and weaken our ability to rebuild what 2020 has ravaged.
runlai_jiang

You Asked About CES 2018. We Answered. - The New York Times - 0 views

www.nytimes.com/...ces-2018-reader-questions.html

shared by runlai_jiang on 15 Jan 18 - No Cached
  • You Asked About CES 2018. We Answered. By BRIAN X. CHEN At the International Consumer Electronics Show this week in Las Vegas, thousands of tech companies showcased some of the hottest new innovations: artificial intelligence, self-driving car tech, the smart home, voice-controlled accessories, fifth-generation cellular connectivity and more.Curious about the new products and how they will affect your personal technology? Readers asked Brian X. Chen, our lead consumer technology writer who is attending the trade show, their questions about wireless, TV and the Internet of Things. Jump to topic: CES Internet of Things TV Wireless Expand All Collapse All /* SHOW LIBRARY ===================== */ .g-show-xsmall, .g-show-small, .g-show-smallplus, .g-show-submedium, .g-show-sub-medium, .g-show-medium, .g-show-large, .g-show-xlarge { display: none; } .g-show { display: block; } .lt-ie10 .g-aiImg { width: 100%; } /* story top */ .story.theme-main .story-header .story-meta .story-heading { max-width: 720px; margin: 0 auto 10px; text-align: center; line-height: 2.844rem; font-size: 2.4rem; } @media only screen and (max-width: 1244px) { .story.theme-main .story-header .story-meta .story-heading { line-height: 2.5596rem; font-size: 2.16rem; } } @media only screen and (max-width: 719px) { .story.theme-main .story-header .story-meta .story-heading { line-height: 2.2752rem; font-size: 1.92rem; } } .story.theme-main .story-header .story-meta .interactive-leadin.summary { max-width: 460px; margin: 0 auto 20px auto; text-align: left; font-size: 17px; line-height: 1.6; } .story.theme-main .story-header .story-meta .byline-dateline { text-align: center; } /* top asset */ .g-top-asset { margin-left: auto; margin-right: auto; margin-bottom: 20px; } .g-top-asset img { width: 100%; } /* body text */ .g-body { max-width: 460px; margin-left: auto; margin-right: auto; font-size: 17px; line-height: 1.6; } .g-body b, .g-body strong { font-family: 'nyt-franklin', arial, sans-serif; font-size: 16px; } .g-body a { text-decoration: underline; } /* subhed */ .g-subhed h2 { max-width: 460px; margin: 2em auto 1em auto; font: 700 1.2em/1.3em 'nyt-franklin', arial, sans-serif; text-align: center; } .viewport-small-10 .g-subhed h2 { font-size: 1.5em; } /* images */ .g-item-image { margin: 25px auto; } .g-item-image img { width: 100%; } /* video */ .g-item-video { margin: 25px auto; } /* sources and credits */ .g-asset-source { padding-top: 3px; } .g-asset-source .g-source { font: 400 12px/15px 'nyt-franklin', arial, sans-serif; color: #999; } .g-asset-source .g-pipe { margin: 0 6px 0 3px; font: 400 12px/12px 'nyt-franklin', arial, sans-serif; color: #999; } .g-asset-source .g-caption { font: 300 14px/17px georgia, 'times new roman', times, serif; } .g-asset-source .g-credit { font: 400 12px/17px 'nyt-franklin', arial, sans-serif; display: inline-block; color: #999; } /* graphics */ .g-item-ai2html { margin: 25px auto; } p.g-asset-hed { font: 700 16px/18px 'nyt-franklin', arial, sans-serif; margin-bottom: 0; } .g-map-key { float: none; clear: both; overflow: hidden; margin: 10px auto 4px auto; } .g-map-key .g-key-row { margin-bottom: 5px; margin-right: 15px; float: left; } .viewport-small .g-map-key .g-key-row { width: auto; margin-bottom: 0; } .viewport-small-20 .g-map-key .g-key-row { width: auto; } .g-map-key .g-key-row .g-key-rect, .g-map-key .g-key-row .g-key-circle { display: inline-block; vertical-align: middle; margin-right: 8px; float: left; } .g-map-key .g-key-row p { font: 500 0.9em/1.6 'nyt-franklin', arial, sans-serif; float: left; vertical-align: middle; margin: -2px 0 0 0; } .viewport-small .g-map-key .g-key-row p { max-width: 92%; } .viewport-small-20 .g-map-key .g-key-row p { width: auto; max-width: none; } .g-map-key .g-key-row .g-key-rect { width: 22px; height: 10px; margin-top: 4px; } .g-map-key .g-key-row .g-key-circle { width: 9px; height: 9px; border-radius: 50%; margin-top: 4px; } .g-map-key .g-key-row .g-key-custom { width: 20px; height: 20px; background-size: 100%; display: block; float: left; width: 24px; height: 24px; margin: -4px 2px 0 0; } .viewport-small .g-map-key .g-key-row-title p { width: 100%; max-width: none; } .g-red-dot, .g-black-dot { display: inline-block; background: #d00; color: white; font-weight: bold; width: 20px; height: 20px; font: 700 14px/1.4 'nyt-franklin', arial, sans-serif; text-align: center; border-radius: 10px; line-height: 20px; } .g-black-dot { background: #222; } /* column text */ .g-column-container { max-width: 460px; margin: 20px auto 0 auto; } .viewport-medium .g-column-container { max-width: 1050px; } .viewport-large .g-column-container { margin-bottom: 30px; } .g-column-container .g-column-hed { font-family: 'nyt-franklin', arial, sans-serif; font-weight: 700; margin-bottom: 2px; } .g-column-container .g-column-col { vertical-align: top; } .viewport-small .g-column-container .g-column-col { display: block; min-width: 100%; } .viewport-medium .g-column-container .g-column-col { min-width: 0; display: inline-block; margin-right: 15px; } .viewport-medium .g-column-container .g-column-col:last-child { margin-right: 0; } .g-column-container .g-column-asset, .g-column-container .g-column-image { margin-bottom: 8px; } .g-column-container .g-column-image img { width: 100%; } /* tables */ .g-table { margin: 0 auto; margin-bottom: 25px; } .g-table tr { border-bottom: 1px solid #ececec; } .g-table p { font: 500 14px/1.4 'nyt-franklin', arial, sans-serif; text-align: left; margin: 6px 0; } /* grid */ .g-grid { margin-bottom: 15px; } .g-grid .g-grid-item { position: relative; display: inline-block; min-width: calc(50% - 5px); } .viewport-small-20 .g-grid .g-grid-item { min-width: calc(33% - 5px); } .viewport-medium .g-grid .g-grid-item { min-width: 0; } .g-grid .g-grid-item p { font: 500 15px/1.4 'nyt-franklin', arial, sans-serif; position: absolute; bottom: 10px; left: 10px; color: #fff; margin-bottom: 0; } /* Mobile issues */ /* Get rid of border under intro and share tools on mobile */ .story-header.interactive-header { border-bottom: none !important; } /* Share tools issues */ /* Pad out the kicker/sharetool space */ .story.theme-main .story-header .story-meta .kicker-container { margin-bottom: 12px; } /* Override the moving sharetools on mobile */ .story.theme-main .story-header .story-meta .kicker-container .sharetools { position: relative; float: right; /*right: 0px;*/ bottom: auto; left: auto; width: auto; margin-top: -6px; clear: none; } /* Maintain the proper space with the section name and kicker next to share tools */ .story.theme-main .story-header .story-meta .interactive-kicker { float: left; width: 70%; display: inline-block; } .g-graphic.g-graphic-freebird .g-ad-wrapper { margin: 30px auto; max-width: 1050px; } .viewport-medium .g-graphic.g-graphic-freebird .g-ad-wrapper { margin: 50px auto; } .g-graphic.g-graphic-freebird .g-ad-wrapper .ad { border-top: 1px solid #e2e2e2 !important; border-bottom: 1px solid #e2e2e2 !important; margin: 0 auto; padding: 10px 0; overflow: hidden; max-width: 100%; } .g-graphic.g-graphic-freebird .g-ad-wrapper .ad div { margin: 0 auto; display: block !important; } .g-graphic.g-graphic-freebird .g-ad-wrapper iframe { margin: 0 auto; display: block; } .g-graphic.g-graphic-freebird .g-ad-wrapper .g-ad-text { text-align: center; font: 500 12px/1.2 "nyt-franklin", arial, sans-serif; color: #bfbfbf; text-transform: uppercase; margin-bottom: 7px; } .ad.top-ad { border: none; margin-left: auto; margin-right: auto; } /* Fix spacing at top of story */ .has-top-ad .story.theme-interactive, .has-ribbon .story.theme-interactive { margin-top: 10px; } /* Fix comments button margin */ .story.theme-interactive .comments-button.theme-kicker { margin-top: 0; } /* Get rid of border under intro and share tools on mobile */ .page-interactive-default .story.theme-main .story-header { border-bottom: none; } /*
  • At the International Consumer Electronics Show this week in Las Vegas, thousands of tech companies showcased some of the hottest new innovations: artificial intelligence, self-driving car tech, the smart home, voice-controlled accessories, fifth-generation cellular connectivity and more.
  • Curious about the new products and how they will affect your personal technology? Readers asked Brian X. Chen, our lead consumer technology writer who attended the trade show, their questions about wireless, TV and the Internet of Things. (In addition,
runlai_jiang

The Big Tech Trends to Follow at CES 2018 - The New York Times - 0 views

www.nytimes.com/...ces-2018.html

technology science

shared by runlai_jiang on 15 Jan 18 - No Cached
  • magine this: When you leave the house, your air conditioner and lights turn off automatically. Then when a motion sensor detects a person in the house, like your house cleaner, it sends an alert to your phone. When you arrive home, a camera recognizes who you are and the door automatically unlocks.
  • Automated technologies like these will be at the forefront of CES, one of the world’s largest tech conventions, next week in Las Vegas. They underline one major trend: Increasingly, the innovations that are making their way into your personal technology aren’t physical electronics or gadgets at all.
  • he culmination of software, algorithms and sensors working together to make your everyday appliances smarter and more automated. It is
  • ...4 more annotations...
  • Alexa and Her CounterpartsAlexa, Amazon’s intelligent assistant that listens to your voice commands to play music, order diapers and place a phone call, will be everywhere at CES.
  • Smart CitiesNowadays, it’s easy to shop for high-quality internet-connected home accessories, like light bulbs, thermostats and security cameras. At CES, Samsung is even planning to introduce a smart refrigerator at the electronics show that can listen to voice commands to control other home accessories.
  • Smarter CarsSelf-driving-car enthusiasts like Elon Musk, the chief executive of Tesla, dream of a future where driverless cars eliminate traffic accidents while letting people do work on their commutes.They can keep dreaming: Autonomous vehicles still have a long way to go before they become safe and properly regulated.
  • Next-Generation Wireless TechnologyAs a growing number of devices rely on artificial intelligence, they will require faster bandwidth speeds. At CES, wireless companies like AT&T and Verizon are expected to give progress reports on so-called 5G, the fifth-generation network technology.With 5G, wireless carriers envision an era of incredibly fast speeds that let smartphone users download a movie in less than five seconds — roughly 100 times faster than the current network technology, 4G. Even more important, 5G is expected to greatly reduce latency to let devices communicate with each other with extremely fast response times.
peterconnelly

'Quantum Internet' Inches Closer With Advance in Data Teleportation - The New York Times - 0 views

www.nytimes.com/...um-internet-teleportation.html

new york times internet

shared by peterconnelly on 02 Jun 22 - No Cached
  • From Santa Barbara, Calif., to Hefei, China, scientists are developing a new kind of computer that will make today’s machines look like toys.
  • the technology will perform tasks in minutes that even supercomputers could not complete in thousands of years.
  • The new experiment indicates that scientists can stretch a quantum network across an increasingly large number of sites. “We are now building small quantum networks in the lab,” said Ronald Hanson
  • ...8 more annotations...
  • Quantum teleportation — what he called “spooky action at a distance” — can transfer information between locations without actually moving the physical matter that holds it.
  • This technology could profoundly change the way data travels from place to place. It draws on more than a century of research involving quantum mechanics, a field of physics that governs the subatomic realm and behaves unlike anything we experience in our everyday lives. Quantum teleportation not only moves data between quantum computers, but it also does so in such a way that no one can intercept it.
  • These entangled systems could be electrons, particles of light or other objects. In the Netherlands, Dr. Hanson and his team used what is called a nitrogen vacancy center — a tiny empty space in a synthetic diamond in which electrons can be trapped.
  • Traditional computers perform calculations by processing “bits” of information, with each bit holding either a 1 or a 0. By harnessing the strange behavior of quantum mechanics, a quantum bit, or qubit, can store a combination of 1 and 0 — a little like how a spinning coin holds the tantalizing possibility that it will turn up either heads or tails when it finally falls flat on the table.
  • Researchers believe these devices could one day speed the creation of new medicines, power advances in artificial intelligence and summarily crack the encryption that protects computers vital to national security. Across the globe, governments, academic labs, start-ups and tech giants are spending billions of dollars exploring the technology.
  • Although it cannot move objects from place to place, it can move information by taking advantage of a quantum property called “entanglement”: A change in the state of one quantum system instantaneously affects the state of another, distant one.
  • “It does not work that way today. Google knows what you are running on its servers.”
  • The information also cannot be intercepted. A future quantum internet, powered by quantum teleportation, could provide a new kind of encryption that is theoretically unbreakable.
Javier E

Ian Hacking, Eminent Philosopher of Science and Much Else, Dies at 87 - The New York Times - 0 views

www.nytimes.com/...ian-hacking-dead.html

philosopher knowledge bias language

shared by Javier E on 28 May 23 - No Cached
  • In an academic career that included more than two decades as a professor in the philosophy department of the University of Toronto, following appointments at Cambridge and Stanford, Professor Hacking’s intellectual scope seemed to know no bounds. Because of his ability to span multiple academic fields, he was often described as a bridge builder.
  • “Ian Hacking was a one-person interdisciplinary department all by himself,” Cheryl Misak, a philosophy professor at the University of Toronto, said in a phone interview. “Anthropologists, sociologists, historians and psychologists, as well as those working on probability theory and physics, took him to have important insights for their disciplines.”
  • Professor Hacking wrote several landmark works on the philosophy and history of probability, including “The Taming of Chance” (1990), which was named one of the best 100 nonfiction books of the 20th century by the Modern Library.
  • ...17 more annotations...
  • “I have long been interested in classifications of people, in how they affect the people classified, and how the effects on the people in turn change the classifications,” he wrote in “Making Up People
  • His work in the philosophy of science was groundbreaking: He departed from the preoccupation with questions that had long concerned philosophers. Arguing that science was just as much about intervention as it was about representation, be helped bring experimentation to center stage.
  • Regarding one such question — whether unseen phenomena like quarks and electrons were real or merely the theoretical constructs of physicists — he argued for reality in the case of phenomena that figured in experiments, citing as an example an experiment at Stanford that involved spraying electrons and positrons into a ball of niobium to detect electric charges. “So far as I am concerned,” he wrote, “if you can spray them, they’re real.”
  • His book “The Emergence of Probability” (1975), which is said to have inspired hundreds of books by other scholars, examined how concepts of statistical probability have evolved over time, shaping the way we understand not just arcane fields like quantum physics but also everyday life.
  • “I was trying to understand what happened a few hundred years ago that made it possible for our world to be dominated by probabilities,” he said in a 2012 interview with the journal Public Culture. “We now live in a universe of chance, and everything we do — health, sports, sex, molecules, the climate — takes place within a discourse of probabilities.”
  • Whatever the subject, whatever the audience, one idea that pervades all his work is that “science is a human enterprise,” Ragnar Fjelland and Roger Strand of the University of Bergen in Norway wrote when Professor Hacking won the Holberg Prize. “It is always created in a historical situation, and to understand why present science is as it is, it is not sufficient to know that it is ‘true,’ or confirmed. We have to know the historical context of its emergence.”
  • Hacking often argued that as the human sciences have evolved, they have created categories of people, and that people have subsequently defined themselves as falling into those categories. Thus does human reality become socially constructed.
  • In 2000, he became the first Anglophone to win a permanent position at the Collège de France, where he held the chair in the philosophy and history of scientific concepts until he retired in 2006.
  • “I call this the ‘looping effect,’” he added. “Sometimes, our sciences create kinds of people that in a certain sense did not exist before.”
  • In “Why Race Still Matters,” a 2005 article in the journal Daedalus, he explored how anthropologists developed racial categories by extrapolating from superficial physical characteristics, with lasting effects — including racial oppression. “Classification and judgment are seldom separable,” he wrote. “Racial classification is evaluation.”
  • Similarly, he once wrote, in the field of mental health the word “normal” “uses a power as old as Aristotle to bridge the fact/value distinction, whispering in your ear that what is normal is also right.”
  • In his influential writings about autism, Professor Hacking charted the evolution of the diagnosis and its profound effects on those diagnosed, which in turn broadened the definition to include a greater number of people.
  • Encouraging children with autism to think of themselves that way “can separate the child from ‘normalcy’ in a way that is not appropriate,” he told Public Culture. “By all means encourage the oddities. By no means criticize the oddities.”
  • His emphasis on historical context also illuminated what he called transient mental illnesses, which appear to be so confined 0cto their time 0c 0cthat they can vanish when times change.
  • “hysterical fugue” was a short-lived epidemic of compulsive wandering that emerged in Europe in the 1880s, largely among middle-class men who had become transfixed by stories of exotic locales and the lure of trave
  • His intellectual tendencies were unmistakable from an early age. “When he was 3 or 4 years old, he would sit and read the dictionary,” Jane Hacking said. “His parents were completely baffled.”
  • He wondered aloud, the interviewer noted, if the whole universe was governed by nonlocality — if “everything in the universe is aware of everything else.”“That’s what you should be writing about,” he said. “Not me. I’m a dilettante. My governing word is ‘curiosity.’”
Javier E

As ARM Chief Steps Down, Successor Talks About 'Body Computing' - NYTimes.com - 0 views

bits.blogs.nytimes.com/...own-successor-points-to-growth

computer chip trends

shared by Javier E on 20 Mar 13 - No Cached
  • ARM was originally a project inside Acorn Computer, a personal computer maker long since broken up. From relative obscurity, ARM’s chip designs now make up nearly one-third of new chip consumption, hurting companies like Intel.
  • The big coming focus, Mr. Segars said, will be deploying chips into a sensor-rich world. “Low-cost microcontrollers with a wireless interface,” he said. “There will be billions of these.” The sensor data will be processed both locally, on millions of small computers, with capabilities to make decisions locally, or collected and passed along to even bigger computer systems. “The systems will go through different aggregation points,” Mr. Segars said. “If an aggregator in the home can tell a fridge is using too much power, maybe it needs servicing.”
  • “The car is ripe for a revolution. It will evolve into a consumer electronics device, paying for parking as you pull up to the curb.” Eventually, said Mr. East, “it’s getting into people’s bodies. Over the next several years, semiconductors will be so small and use so little power that they’ll run inside us as systems.”
Emily Horwitz

Ah, Wilderness! Nature Hike Could Unlock Your Imagination : Shots - Health News : NPR - 0 views

www.npr.org/...-could-unlock-your-imagination

npr neuroscience nature study wilderness health science technology

shared by Emily Horwitz on 13 Dec 12 - No Cached
  • Want to be more creative? Drop that iPad and head to the great outdoors.
  • David Strayer, a cognitive neuroscientist in Uta
  • t sent students out into nature with computers, to test their attention spans. "It was an abysmal failure,
  • ...12 more annotations...
  • students didn't want to be anywhere near the computers
  • pencil-and-paper creativity quiz, the so-called Remote Associates Test, which asks people to identify word associations that aren't immediately obvious. Four days into the trip, they took the test again
  • 45 percent improvement.
  • hardly scientific.
  • took the test four days into the wilderness did 50 percent better than those who were still immersed in modern lif
  • Outward Bound is notoriously strict about bringing artifacts of modern life into the wilderness.
  • Half of the 56 hikers took the test before going backpacking in the wilderness, and the other half took the RAT test on the fourth day of their trip. The groups went into the wild in Alaska, Colorado, Maine and Washington.
  • researchers had already taken the test once.
  • exposure to nature over a number of days, which has been shown in other studies to improve thinking
  • exercise
  • abandoning electronic devices
  • constant texting and checking in on Facebook are not making us think more clearly.
  • Emily Horwitz on 13 Dec 12
     
    An interesting connection between being in nature and being creative and mentally present.
Megan Flanagan

'Affluenza' teen's mom, Tonya Couch, has bond lowered - CNN.com - 0 views

www.cnn.com/...index.html

brain mom crisis

shared by Megan Flanagan on 14 Jan 16 - No Cached
  • has posted bail after her bond was lowered from $1 million to $75,000.
  • after she's fitted with an electronic ankle monitor
  • Tonya Couch of helping her son leave the country to avoid a probation hearing that might have led to jail time for him
  • ...9 more annotations...
  • after a Los Angeles judge approved her extradition more than a week after Mexican authorities detained mother and son in a Pacific resort town
  • undergo a mental exam after the court found "reasonable cause" to believe that she suffers from "a mental illness or is a person with a mental retardation,"
  • mental examination will determine whether there is clinical evidence to support the argument that Tonya Couch may be incompetent to stand trial.
  • withdrew $30,000 from her account and told her husband that he would not see them again,
  • on probation for killing four people in a drunken driving accident in 2013, when he was 16.
  • lawyers cited the now notorious "affluenza" defense, suggesting he was too rich and spoiled to understand the consequences of his actions.
  • Mexican judge granted the teen a temporary stay, halting deportation proceedings.
  • Mothers Against Drunk Driving started a petition
  • ask for Ethan Couch to be moved from the juvenile justice system to the adult criminal system
sandrine_h

Does your smartphone make you less likely to trust others? - 0 views

theconversation.com/s-likely-to-trust-others-67814

shared by sandrine_h on 16 Jan 17 - No Cached
  • When trust between people in a country goes up, for example, so does economic growth. At the individual level, people who trust others more also tend to have better health and higher well-being.Could our increasing reliance on information from devices, rather than from other people, be costing us opportunities to build social capital?
  • As information technology continues to make our lives easier, our findings highlight the possible social costs of constant information access: By turning to convenient electronic devices, people may be forgoing opportunities to foster trust – a finding that seems particularly poignant in the present political climate.
anonymous

Symmetry in the universe: Physics says you shouldn't exist. - 0 views

www.slate.com/...ou_shouldn_t_exist.single.html

science physics inconsistencies

shared by anonymous on 21 Nov 13 - No Cached
  • You, me, and even the most calming manatee are nothing but impurities in an otherwise beautifully simple universe.
  • Your existence wasn’t just predicated on amorousness and luck of your ancestors, but on an almost absurdly finely tuned universe. Had the universe opted to turn up the strength of the electromagnetic force by even a small factor, poof
  • if the universe were only minutely denser than the one we inhabit, it would have collapsed before it began.
  • ...12 more annotations...
  • Worse still, the laws of physics themselves seem to be working against us. Ours isn’t just a randomly hostile universe, it's an actively hostile universe
  • The history of physics, in fact, is a marvel of using simple symmetry principles to construct complicated laws of the universe
  • if the entire universe were made symmetric, then all of the good features (e.g., you) are decidedly asymmetric lumps that ruin the otherwise perfect beauty of the cosmo
  • it would be a mistake to be comforted by the symmetries of the universe. In truth, they are your worst enemies. Everything we know about those rational, predictable arrangements dictates that you shouldn't be here at all.
  • How hostile is the universe to your fundamental existence? Very. Even the simplest assumptions about our place in the universe seem to lead inexorably to devastating results
  • The symmetry of the universe would bake us in no time at all, but an asymmetry rescues us
  • In literally every experiment and observation that we’ve ever done, matter and antimatter get created (or annihilated) in perfect concert. That is, every experiment except for one: us.
  • Matter and antimatter should have completely annihilated one another in the first nanoseconds after the Big Bang. You should not even exist. But you do, and there’s lots more matter where you came from.
  • if the perfect symmetry between matter and antimatter remained perfect, you wouldn’t be here to think about it.
  • The flow of time (as near as we can tell) is completely arbitrary. Does entropy increase with time or does it make time? Are our memories the thing that ultimately breaks the symmetry of time?
  • It seems only a matter of luck (and some fairly arbitrary-looking math) that a symmetric universe would end up being remotely hospitable to complex creatures like us
  • Without electrons binding to protons, there would be no chemistry, no molecules, and nothing more complicated than a cloud of charged gas. And you’re not a sentient cloud of gas, are you?
sissij

Sleeping Wipes Out Certain Memories - And That's a Good Thing, Reveal Studies | Big Think - 0 views

bigthink.com/...pruned-properly-when-you-sleep

science brain science research

shared by sissij on 07 Feb 17 - No Cached
  • But what is its evolutionary purpose – what kind of changes do our brains undergo when we sleep?
  • suggest our brains undergo a pruning cycle while we rest.
  • Its important to note these studies are still in their early stages. The tests were done on mice.
  • ...3 more annotations...
  • letting us forget the less relevant information while strengthening memories that may be important.
  • However, modern humans don't abide by a natural sleep cycle anymore – we look at our phones before bed and expose ourselves to things that cause our brains to think sleep is not on the menu.
  • they might not require a chemical crutch to get some rest.
  • sissij on 07 Feb 17
     
    This article shows that how unreliable our memory is. Every night when we go to sleep, our memory is edited and our brain would delete some irrelevant things. So our memory is not a primary source and I think the words of witnesses on the court can only be a reference, not a direct evidence. Also, in this article, the author states the uncertainties and limits of the experiment, showing that the result of the experiment in this stage can only serves as a suggestion, not a direct evidence. --Sissi (2/7/2017)
1 - 20 of 71 Next › Last »
Showing 20▼ items per page