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Javier E

As Researchers Turn to Google, Libraries Navigate the Messy World of Discovery Tools - ... - 0 views

  • a major change is under way in how libraries organize information. Instead of bewildering users with a bevy of specialized databases—books here, articles there—many libraries are bulldozing their digital silos. They now offer one-stop search boxes that comb entire collections, Google style.
  • Vendors of discovery tools will make deals with providers that sell content to libraries, he says, so that content can be represented in the discovery tools’ indexes and made available for search. (Beyond products from Ebsco and ProQuest, other major tools in this genre, known as "web scale" or "index based" discovery, include Primo, from Ex Libris, and WorldCat Discovery Services, from OCLC.)
  • Another is that discovery software, by sluicing content together, could deluge users with less-appropriate resources
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  • the rollout of one-stop search tools is "really intentionally trying to change the way people do research,"
  • "That’s bound to change what people find."
  • one fear is that firms could favor their own content in results.
  • Mr. Asher’s experiment discovered that default settings of the tools had a major effect on what resources students chose. Working with Google Scholar, which is integrated with Google Books, students used more books. With Summon, they used a lot of shorter newspaper and magazine articles. With ­Ebsco Discovery Service, they used more journals, which meant they scored highest under the study’s rating rubric.
  • Mr. Asher believes that "it’s a logical impossibility to create a querying tool that doesn’t have any form of bias." He speculates that discovery vendors may have better information about their own content, boosting certain articles higher in results.
  • the competition for student and faculty attention has only intensified since 2004, when Google’s "simple way to broadly search for scholarly literature" made its debut. That free service, called Google Scholar, has many fans in academe.
  • Mr. Asher is familiar with the criticisms of Google Scholar. After all, his own study listed them: "limited advanced search functionality, incomplete or inaccurate metadata, inflated citation counts, lack of usage statistics, and inconsistent coverage across disciplines."
  • "I kind of hate to say it, since I am a librarian," he says. "We pay a lot of money for discovery tools. And then I go off and just use Google Scholar."
johnsonma23

BBC News - Antibiotics: US discovery labelled 'game-changer' for medicine - 0 views

  • Antibiotics: US discovery labelled 'game-changer' for medicine
  • The decades-long drought in antibiotic discovery could be over after a breakthrough by US scientists.
  • ielded 25 new antibiotics, with one deemed "very promising".
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  • The researchers, at the Northeastern University in Boston, Massachusetts, turned to the source of nearly all antibiotics - soil.
  • It allowed the unique chemistry of soil to permeate the room, but kept the bacteria in place for study.
  • The scientists involved believe they can grow nearly half of all soil bacteria.
  • uncultured bacteria do harbour novel chemistry that we have not seen before. That is a promising source of new antimicrobials and will hopefully help revive the field of antibiotic discovery."
  • The researchers also believe that bacteria are unlikely to develop resistance to teixobactin.
  • There are limits to the discovery of the antibiotic teixobactin, which has yet to be tested in people.
katrinaskibicki

Revolutionary discovery: Scientists find gravitational waves Einstein predicted - 0 views

  • For the first time ever, scientists have directly detected gravitational waves, bizarre ripples in space-time foreseen by Einstein a century ago. The discovery was the final, acid test of Einstein’s general theory of relativity.
  • Einstein has been proven right – again.For the first time ever, scientists have directly detected gravitational waves, bizarre ripples in space-time foreseen by Einstein a century ago. The discovery was the final, acid test of Einstein’s celebrated general theory of relativity, and once again Einstein’s genius held up to scrutiny.
  • The waves in question arose during the close approach of two black holes some 1.3 billion years ago, when multicellular life began to spread on Earth. Traveling at the speed of light, the waves reached our planet in September -- precisely when a observatory built to detect them was emerging from a long hiatus.
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  • When scientists first saw the data suggesting that they’d captured a gravitational wave, they thought the results seemed to good to be true. Past claims of gravitational waves have proven unreliable, and there are many possible sources of error.
  • Gravitational waves confirmedAstrophysicists have announced the discovery of gravitational waves, ripples that travel at the speed of light through the fabric of space-time. A 1916 theory of Albert Einstein’s predicted their existence. .oembed-asset-photo-image { width: 100%; }
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    A new scientific discovery shows that Einstein's predictions were correct, yet again!
kushnerha

How to Cultivate the Art of Serendipity - The New York Times - 0 views

  • A surprising number of the conveniences of modern life were invented when someone stumbled upon a discovery or capitalized on an accident
  • wonder whether we can train ourselves to become more serendipitous. How do we cultivate the art of finding what we’re not seeking?
  • Croatian has no word to capture the thrill of the unexpected discovery, so she was delighted when — after moving to the United States on a Fulbright scholarship in the 1980s — she learned the English word “serendipity.”
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  • Today we think of serendipity as something like dumb luck. But its original meaning was very different.
  • suggested that this old tale contained a crucial idea about human genius: “As their highnesses travelled, they were always making discoveries, by accident and sagacity, of things which they were not in quest of.” And he proposed a new word — “serendipity” — to describe this princely talent for detective work. At its birth, serendipity meant a skill rather than a random stroke of good fortune.
  • sees serendipity as something people do. In the mid-1990s, she began a study of about 100 people to find out how they created their own serendipity, or failed to do so.
  • As people dredge the unknown, they are engaging in a highly creative act. What an inventor “finds” is always an expression of him- or herself.
  • subjects fell into three distinct groups. Some she called “non-encounterers”; they saw through a tight focus, a kind of chink hole, and they tended to stick to their to-do lists when searching for information rather than wandering off into the margins. Other people were “occasional encounterers,” who stumbled into moments of serendipity now and then. Most interesting were the “super-encounterers,” who reported that happy surprises popped up wherever they looked.
  • “gathering string” is just another way of talking about super-encountering. After all, “string” is the stuff that accumulates in a journalist’s pocket. It’s the note you jot down in your car after the interview, the knickknack you notice on someone’s shelf, or the anomaly that jumps out at you in Appendix B of an otherwise boring research study.
  • came up with the term super-encounterer to give us a way to talk about the people rather than just the discoveries. Without such words, we tend to become dazzled by the happy accident itself, to think of it as something that exists independent of an observer.
  • We can slip into a twisted logic in which we half-believe the penicillin picked Alexander Fleming to be its emissary, or that the moons of Jupiter wanted to be seen by Galileo. But discoveries are products of the human mind.
  • You become a super-encounterer, according to Dr. Erdelez, in part because you believe that you are one — it helps to assume that you possess special powers of perception
  • One survey of patent holders (the PatVal study of European inventors, published in 2005) found that an incredible 50 percent of patents resulted from what could be described as a serendipitous process. Thousands of survey respondents reported that their idea evolved when they were working on an unrelated project — and often when they weren’t even trying to invent anything.
  • need to develop a new, interdisciplinary field — call it serendipity studies — that can help us create a taxonomy of discoveries in the chemistry lab, the newsroom, the forest, the classroom, the particle accelerator and the hospital. By observing and documenting the many different “species” of super-encounterers, we might begin to understand their minds.
  • Of course, even if we do organize the study of serendipity, it will always be a whimsical undertaking, given that the phenomenon is difficult to define, amazingly variable and hard to capture in data. The clues will no doubt emerge where we least expect them
Javier E

A Better Way to Teach Math - NYTimes.com - 2 views

  • “Almost every kid — and I mean virtually every kid — can learn math at a very high level, to the point where they could do university level math courses,”
  • “If you ask why that’s not happening, it’s because very early in school many kids get the idea that they’re not in the smart group, especially in math. We kind of force a choice on them: to decide that either they’re dumb or math is dumb.”
  • In particular, math teachers often fail to make sufficient allowances for the limitations of working memory and the fact that we all need extensive practice to gain mastery in just about anything.
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  • current teaching approaches underestimate the amount of explicit guidance, “scaffolding” and practice children need to consolidate new concepts. Asking children to make their own discoveries before they solidify the basics is like asking them to compose songs on guitar before they can form a C chord.
  • he gained a reputation as a kind of math miracle worker. Many students were sent to him because they had severe learning disabilities (a number have gone on to do university-level math). Mighton found that to be effective he often had to break things down into minute steps and assess each student’s understanding at each micro-level before moving on.
  • Mighton saw that if he approached teaching this way, he could virtually guarantee that every student would experience success. In turn, the children’s math anxiety diminished. As they grew more confident, they grew excited, and they began requesting harder challenges. “More than anything, kids love success,” he says, “and they love getting to higher levels, like in a video game.”
  • Mighton saw that if you provided painstaking guidance, children would make their own discoveries. That’s why he calls his approach “guided discovery.”
  • Schools in British Columbia evaluate students based on whether they meet expectations for learning outcomes. “Teachers who used Jump were suddenly finding that they had all of their kids in the ‘fully meeting expectations’ category,” Grant told me. “It was such a foreign experience. It doesn’t typically happen when we’re teaching science or language arts. And they were kind of at a loss. ‘What do we do about this?’”
  • Even deeper, for children, math looms large; there’s something about doing well in math that makes kids feel they are smart in everything. In that sense, math can be a powerful tool to promote social justice. “When you have all the kids in a class succeeding in a subject, you see that they’re competing against the problem, not one another,” says Mighton. “It’s like they’re climbing a mountain together. You see a very healthy kind of competition. And it makes kids more generous to one another. Math can save us.”
sissij

NASA's Big Announcement? A New Solar System That Could Sustain Life | Big Think - 0 views

  • Our solar system is spread out by comparison. This cramped little system finds each planet’s orbit closer to their star, TRAPPIST-1, than Mercury is to ours. Of all the planets discovered, TRAPPIST-1f is the most likely to sustain life, NASA scientists say. Those closer planets may be too hot to contain liquid water, while those beyond may be too cold.
  • Another interesting consideration, this star, since it burns so slowly, will likely outlive ours by a trillion years. So if the Earth is vanquished and the situation is right, we may find a new Eden on TRAPPIST-1f.
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    I think this is a very striking discovery because it gives us possibilities that there might be alien lives. We have been searching potential planet that can sustain life for a long time and now scientists claim that they have found one at 40 light year away from us. It may lead us to discovery of new living creatures. --Sissi (2/27/2017)
Javier E

Interview: Ted Chiang | The Asian American Literary Review - 0 views

  • I think most people’s ideas of science fiction are formed by Hollywood movies, so they think most science fiction is a special effects-driven story revolving around a battle between good and evil
  • I don’t think of that as a science fiction story. You can tell a good-versus-evil story in any time period and in any setting. Setting it in the future and adding robots to it doesn’t make it a science fiction story.
  • I think science fiction is fundamentally a post-industrial revolution form of storytelling. Some literary critics have noted that the good-versus-evil story follows a pattern where the world starts out as a good place, evil intrudes, the heroes fight and eventually defeat evil, and the world goes back to being a good place. Those critics have said that this is fundamentally a conservative storyline because it’s about maintaining the status quo. This is a common story pattern in crime fiction, too—there’s some disruption to the order, but eventually order is restored. Science fiction offers a different kind of story, a story where the world starts out as recognizable and familiar but is disrupted or changed by some new discovery or technology. At the end of the story, the world is changed permanently. The original condition is never restored. And so in this sense, this story pattern is progressive because its underlying message is not that you should maintain the status quo, but that change is inevitable. The consequences of this new discovery or technology—whether they’re positive or negative—are here to stay and we’ll have to deal with them.
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  • There’s also a subset of this progressive story pattern that I’m particularly interested in, and that’s the “conceptual breakthrough” story, where the characters discover something about the nature of the universe which radically expands their understanding of the world.  This is a classic science fiction storyline.
  • one of the cool things about science fiction is that it lets you dramatize the process of scientific discovery, that moment of suddenly understanding something about the universe. That is what scientists find appealing about science, and I enjoy seeing the same thing in science fiction.
  • when you mention myth or mythic structure, yes, I don’t think myths can do that, because in general, myths reflect a pre-industrial view of the world. I don’t know if there is room in mythology for a strong conception of the future, other than an end-of-the-world or Armageddon scenario …
catbclark

Jawbone's Discovery Fills Barren Evolutionary Period - NYTimes.com - 0 views

  • Jawbone’s Discovery Fills Barren Evolutionary Perio
  • This was a time when the human genus, Homo, was getting underway. The 2.8-million-year-old jawbone of a Homo habilis predates by at least 400,000 years any previously known Homo fossils.
  • The reconstruction, suggesting a plausible evolutionary link between A. afarensis and H. habilis, yielded a remarkably primitive picture of a deep-rooted diversity of a species that emerged much earlier than the 2.3 million years ago suggested by some specimens. The teeth and jaws appeared to be more similar to A. afarensis than to subsequent Homo erectus or Homo sapiens, modern humans that emerged about 200,000 years ago.
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  • Dr. Spoor’s predictions were drawn from a digital reconstruction of the disturbed remains of the jaws of the original 1.8-million-year-old Homo habilis specimen found 50 years ago by the legendary fossil hunters Louis and Mary Leakey at Olduvai Gorge in Tanzania.
  • possible result of widespread climate change affecting species changes and extinctions.
Javier E

What Happened Before the Big Bang? The New Philosophy of Cosmology - Ross Andersen - Te... - 1 views

  • This question of accounting for what we call the "big bang state" -- the search for a physical explanation of it -- is probably the most important question within the philosophy of cosmology, and there are a couple different lines of thought about it.
  • One that's becoming more and more prevalent in the physics community is the idea that the big bang state itself arose out of some previous condition, and that therefore there might be an explanation of it in terms of the previously existing dynamics by which it came about
  • The problem is that quantum mechanics was developed as a mathematical tool. Physicists understood how to use it as a tool for making predictions, but without an agreement or understanding about what it was telling us about the physical world. And that's very clear when you look at any of the foundational discussions. This is what Einstein was upset about; this is what Schrodinger was upset about. Quantum mechanics was merely a calculational technique that was not well understood as a physical theory. Bohr and Heisenberg tried to argue that asking for a clear physical theory was something you shouldn't do anymore. That it was something outmoded. And they were wrong, Bohr and Heisenberg were wrong about that. But the effect of it was to shut down perfectly legitimate physics questions within the physics community for about half a century. And now we're coming out of that
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  • One common strategy for thinking about this is to suggest that what we used to call the whole universe is just a small part of everything there is, and that we live in a kind of bubble universe, a small region of something much larger
  • Newton realized there had to be some force holding the moon in its orbit around the earth, to keep it from wandering off, and he knew also there was a force that was pulling the apple down to the earth. And so what suddenly struck him was that those could be one and the same thing, the same force
  • That was a physical discovery, a physical discovery of momentous importance, as important as anything you could ever imagine because it knit together the terrestrial realm and the celestial realm into one common physical picture. It was also a philosophical discovery in the sense that philosophy is interested in the fundamental natures of things.
  • There are other ideas, for instance that maybe there might be special sorts of laws, or special sorts of explanatory principles, that would apply uniquely to the initial state of the universe.
  • The basic philosophical question, going back to Plato, is "What is x?" What is virtue? What is justice? What is matter? What is time? You can ask that about dark energy - what is it? And it's a perfectly good question.
  • right now there are just way too many freely adjustable parameters in physics. Everybody agrees about that. There seem to be many things we call constants of nature that you could imagine setting at different values, and most physicists think there shouldn't be that many, that many of them are related to one another. Physicists think that at the end of the day there should be one complete equation to describe all physics, because any two physical systems interact and physics has to tell them what to do. And physicists generally like to have only a few constants, or parameters of nature. This is what Einstein meant when he famously said he wanted to understand what kind of choices God had --using his metaphor-- how free his choices were in creating the universe, which is just asking how many freely adjustable parameters there are. Physicists tend to prefer theories that reduce that number
  • You have others saying that time is just an illusion, that there isn't really a direction of time, and so forth. I myself think that all of the reasons that lead people to say things like that have very little merit, and that people have just been misled, largely by mistaking the mathematics they use to describe reality for reality itself. If you think that mathematical objects are not in time, and mathematical objects don't change -- which is perfectly true -- and then you're always using mathematical objects to describe the world, you could easily fall into the idea that the world itself doesn't change, because your representations of it don't.
  • physicists for almost a hundred years have been dissuaded from trying to think about fundamental questions. I think most physicists would quite rightly say "I don't have the tools to answer a question like 'what is time?' - I have the tools to solve a differential equation." The asking of fundamental physical questions is just not part of the training of a physicist anymore.
  • The question remains as to how often, after life evolves, you'll have intelligent life capable of making technology. What people haven't seemed to notice is that on earth, of all the billions of species that have evolved, only one has developed intelligence to the level of producing technology. Which means that kind of intelligence is really not very useful. It's not actually, in the general case, of much evolutionary value. We tend to think, because we love to think of ourselves, human beings, as the top of the evolutionary ladder, that the intelligence we have, that makes us human beings, is the thing that all of evolution is striving toward. But what we know is that that's not true. Obviously it doesn't matter that much if you're a beetle, that you be really smart. If it were, evolution would have produced much more intelligent beetles. We have no empirical data to suggest that there's a high probability that evolution on another planet would lead to technological intelligence.
oliviaodon

NASA Just Discovered Seven New Exoplanets... So What? - 0 views

  • On Wednesday, the scientists at NASA kind of freaked out. They announced the discovery of some seemingly Earth-like planets outside of our solar system, a group of rocky globes they're calling 'TRAPPIST-1.'
  • To be completely blunt, the most exiting thing for actual scientists is that these planets are close enough that we're actually going to be able to study them – particularly when the James Webb Space Telescope launches (October 2018.) When that launches, it will have a real shot at actually taking a look at the atmospheres of these planets – or if they have atmospheres at all. So it's like a promise of future excitement
  • The closer the system is to our solar system – the more the star is like the Sun and the planet is like the Earth, the more likely we are to understand what we're looking at. That's what makes it exciting.
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  • At the moment, all you really tell from the transits is these are small black dots. We just get a radius – and if we're super lucky – as they were in the case of this system, they can get masses. The sizes and masses of these planets is really valuable information though, because it does suggests that most of them are rocky. Six of the seven planets look like they're rocky.  And being Earth-sized, we think it's a good place: an atmosphere thick enough to keep you warm and last for billions of years, but not so thick that you end up being a gas giant planet.
  • Most of them are the right distance from a star that maybe they could have liquid water on their surfaces. But that's a huge maybe
  • o it's not really that we think Earth-like life is the only life that can be out there. It's just the only life we can detect.
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    This article discusses the potential of a new scientific discovery: seven exoplanets outside of our solar system. This article does a great job in mentioning the limitations of science, however.
kushnerha

Physicists in Europe Find Tantalizing Hints of a Mysterious New Particle - The New York... - 1 views

  • 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.
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  • noting that the history of particle physics is rife with statistical flukes and anomalies that disappeared when more data was compiled
  • A coincidence is the most probable explanation for the surprising bumps in data from the collider, physicists from the experiments cautioned
  • Physicists could not help wondering if history was about to repeat itself. It was four years ago this week that the same two teams’ detection of matching bumps in Large Hadron Collider data set the clock ticking for the discovery of the Higgs boson six months later.
  • If the particle is real, Dr. Lykken said, physicists should know by this summer, when they will have 10 times as much data to present to scientists from around the world who will convene in Chicago
  • 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.
  • 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 main news since then has been mainly that there is no news yet, only tantalizing hints, bumps in the data, that might be new particles and signposts of new theories, or statistical demons.
  • 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.
  • “The more nonstandard the better,” said Joe Lykken, the director of research at the Fermi National Accelerator Laboratory and a member of one of the CERN teams. “It will give people a lot to think about. We get paid to speculate.”
  • 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.It might, they hoped, be the end of the beginning.
  • Such a discovery would augur a fruitful future for cosmological wanderings and for the CERN collider, which will be running for the next 20 years.
caelengrubb

How Galileo Changed Your Life - Biography - 0 views

  • Galileo’s contributions to the fields of astronomy, physics, mathematics, and philosophy have led many to call him the father of modern science.
  • But his controversial theories, which impacted how we see and understand the solar system and our place within it, led to serious conflict with the Catholic Church and the long-time suppression of his achievements
  • Galileo developed one of the first telescopesGalileo didn’t invent the telescope — it was invented by Dutch eyeglass makers — but he made significant improvements to it.
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  • His innovations brought him both professional and financial success. He was given a lifetime tenure position at the University of Padua, where he had been teaching for several years, at double his salary.
  • And he received a contract to produce his telescopes for a group of Venetian merchants, eager to use them as a navigational tool.
  • He helped created modern astronomyGalileo turned his new, high-powered telescope to the sky. In early 1610, he made the first in a remarkable series of discoveries.
  • While the scientific doctrine of the day held that space was perfect, unchanging environments created by God, Galileo’s telescope helped change that view
  • His studies and drawings showed the Moon had a rough, uneven surface that was pockmarked in some places, and was actually an imperfect sphere
  • He was also one of the first people to observe the phenomena known as sunspots, thanks to his telescope which allowed him to view the sun for extended periods of time without damaging the eye.
  • Galileo helped prove that the Earth revolved around the sunIn 1610, Galileo published his new findings in the book Sidereus Nuncius, or Starry Messenger, which was an instant success
  • He became close with a number of other leading scientists, including Johannes Kepler. A German astronomer and mathematician, Kepler’s work helped lay the foundations for the later discoveries of Isaac Newton and others.
  • Kepler’s experiments had led him to support the idea that the planets, Earth included, revolved around the sun. This heliocentric theory, as well as the idea of Earth’s daily rotational turning, had been developed by Polish astronomer Nicolaus Copernicus half a century earlier
  • Their belief that the Sun, and not the Earth, was the gravitational center of the universe, upended almost 2,000 years of scientific thinking, dating back to theories about the fixed, unchanging universe put forth by the Greek philosopher and scientist Aristotle.
  • Galileo had been testing Aristotle’s theories for years, including an experiment in the late 16th century in which he dropped two items of different masses from the Leaning Tower of Pisa, disproving Aristotle’s belief that objects would fall at differing speeds based on their weight (Newton later improved upon this work).
  • Galileo paid a high price for his contributionsBut challenging the Aristotelian or Ptolemaic theories about the Earth’s role in the universe was dangerous stuff.
  • Geocentrism was, in part, a theoretical underpinning of the Roman Catholic Church. Galileo’s work brought him to the attention of Church authorities, and in 1615, he was called before the Roman Inquisition, accused of heresy for beliefs which contradicted Catholic scripture.
  • The following year, the Church banned all works that supported Copernicus’ theories and forbade Galileo from publicly discussing his works.
  • In 1632, after the election of a new pope who he considered more liberal, he published another book, Dialogue on the Two Chief World Systems, Ptolemaic and Copernican, which argued both sides of the scientific (and religious) debate but fell squarely on the side of Copernicus’ heliocentrism.
  • Galileo was once again summoned to Rome. In 1633, following a trial, he was found guilty of suspected heresy, forced to recant his views and sentenced to house arrest until his death in 1642.
  • It took nearly 200 years after Galileo’s death for the Catholic Church to drop its opposition to heliocentrism.
  • In 1992, after a decade-long process and 359 years after his heresy conviction, Pope John Paul II formally expressed the Church’s regret over Galileo’s treatment.
Javier E

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

  • 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.
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  • “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.
  • 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.
  • 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.
  • 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.
  • 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.
Emily Horwitz

UK, Japan scientists win Nobel for stem cell breakthroughs | Reuters - 0 views

  • Scientists from Britain and Japan shared a Nobel Prize on Monday for the discovery that adult cells can be transformed back into embryo-like stem cells that may one day regrow tissue in damaged brains, hearts or other organs.
  • discovered ways to create tissue that would act like embryonic cells, without the need to harvest embryos.
  • "These groundbreaking discoveries have completely changed our view of the development and specialization of cells," the Nobel Assembly at Stockholm's Karolinska Institute said.
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  • big hope for stem cells is that they can be used to replace damaged tissue in everything from spinal cord injuries to Parkinson's disease.
  • Scientists once thought it was impossible to turn adult tissue back into stem cells, which meant that new stem cells could only be created by harvesting embryos - a practice that raised ethical qualms in some countries and also means that implanted cells might be rejected by the body.
  • The new stem cells are known as "induced pluripotency stem cells", or iPS cells.
  • "We would like to be able to find a way of obtaining spare heart or brain cells from skin or blood cells. The important point is that the replacement cells need to be from the same individual, to avoid problems of rejection and hence of the need for immunosuppression."
  • Thomas Perlmann, Nobel Committee member and professor of Molecular Development Biology at the Karolinska Institute said: "Thanks to these two scientists, we know now that development is not strictly a one-way street."
  • "You can't take out a large part of the heart or the brain or so to study this, but now you can take a cell from for example the skin of the patient, reprogram it, return it to a pluripotent state, and then grow it in a laboratory," he said.
Javier E

Michael Bloomberg: 6 ways to stop gun madness - 0 views

  • For more than a decade, both parties in Washington have mostly looked the other way when mass shootings occur. And they have mostly ignored the 34 victims who are murdered with guns every single day.
  • prohibit the manufacture and sale of the military-style assault weapons and high-capacity ammunition clips that have been used in too many mass shootings, including in Newtown. The previous ban on assault weapons expired in 2004. While President George W. Bush supported reinstating it, Congress never acted. The time has plainly come.
  • fix the broken background check system. Currently, nearly half of all gun sales in the U.S. are conducted without a background check. Criminals, the mentally ill, minors and domestic abusers are all prohibited from purchasing guns, but they all can do so as easily as attending a gun show or going online.
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  • fill the vacancy at the top of the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF), which has been without a director for six years.
  • make gun trafficking a felony. Gun rights advocates agree that penalties for illegal use and possession of guns should be stiffened -- and so should penalties on those who are engaged in gun trafficking.
  • requires the federal government to compel states to submit all necessary records on felons, domestic abusers, the seriously mentally ill and others to the background check system.
  • step up its prosecution of gun criminals who try to buy guns. In 2009, 71,000 people who had been convicted of gun crimes tried to buy guns by lying on their background checks. Yet the federal government prosecuted only 77 of those cases.
  • crack down on rogue gun dealers.
  • . If President Obama and Congress fail to lead, 48,000 Americans will be killed with guns over the next four years.
Lindsay Lyon

Largest Prime Discovered | Mathematics | LiveScience - 0 views

  • The largest prime number yet has been discovered — and it's 17,425,170 digits long. The new prime number crushes the last one discovered in 2008, which was a paltry 12,978,189 digits long.
  • The number — 2 raised to the 57,885,161 power minus 1 — was discovered by University of Central Missouri mathematician Curtis Cooper as part of a giant network of volunteer computers
  • "It's analogous to climbing Mt. Everest," said George Woltman, the retired, Orlando, Fla.-based computer scientist who created GIMPS. "People enjoy it for the challenge of the discovery of finding something that's never been known before."
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  • mathematicians have devised a much cleverer strategy, that dramatically reduces the time to find primes. That method uses a formula to check much fewer numbers.
  • the number is the 48th example of a rare class of primes called Mersenne Primes. Mersenne primes take the form of 2 raised to the power of a prime number minus 1. Since they were first described by French monk Marin Mersenne 350 years ago, only 48 of these elusive numbers have been found, including the most recent discovery. [The Most Massive Numbers in the Universe]
  • mber is the 48th example of a rare class of primes called Mersenne Primes. Mersenne primes take the form of 2 raised to the power of a prime number minus 1. Since they were first described by French monk Marin Mersenne 350 years ago, only 48 of these elusive numbers have been found
  • the 48th example of a rare class of primes called Mersenne Primes. Mersenne primes take the form of 2 raised to the power of a prime number minus 1
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    An interesting article that reminded me of the discussions we had last year on whether math was invented or discovered. With regard to prime numbers, could we ever stop finding "new" ones? Can we ever find a formula to pinpoint every single prime number without dividing it by other numbers?
maxwellokolo

Astronomers discover 7 Earth-like planets orbiting nearby star - 0 views

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    This discovery outside of our solar system is rare because the planets have the winning combination of being similar in size to Earth and temperate, meaning they could have water on their surfaces and potentially support life. Developing story - more to come
oliviaodon

A scientific revolution? - 0 views

  • Puzzle-solving science, according to Kuhn, can therefore trigger a scientific revolution as scientists struggle to explain these anomalies and develop a novel basic theory to incorporate them into the existing body of knowledge. After an extended period of upheaval, in which followers of the new theory storm the bastions of accepted dogma, the old paradigm is gradually replaced.
  • biology is heading towards a similar scientific revolution that may shatter one of its most central paradigms. The discovery of a few small proteins with anomalous behaviour is about to overcome a central tenet of molecular biology: that information flows unidirectionally from the gene to the protein to the phenotype. It started with the discovery that prions, a class of small proteins that can exist in different forms, cause a range of highly debilitating diseases. This sparked further research
  • Scientific revolutions are still rare in biology, given that the field, unlike astronomy or physics, is relatively young.
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  • The idea that all living beings stem from a primordial cell dating back two billion years is, in my opinion, a true paradigm. It does not have a heuristic value, unlike paradigms in physics such as gravitation or Einstein's famous equation, but it has a fundamental aspect.
sissij

Bacteria Have a Social Contract, and Unnamed Natural Laws | Big Think - 1 views

  • the evolutionary logic of relationships beyond rivalry
  • ~98% of bacterial species don’t thrive outside mixed-species colonies.
  • Bacteria are not self-sufficient: They’ve co-evolved to depend on each other.
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  • You’re in a collective extended “survival vehicle” relationship.
  • In a kind of no-brainer biochemical “social contract,” bacterial colonies, like human communities, have to handle the “common good” (suppressing cheating, free-riding, the “tragedy of the commons,” etc).
  • We dominate because we’re the best cooperators (Yuval Harari).
  • Evolution is itself a free-floating logic pattern (for discovering other, ever more effective logic patterns, and enacting “competence without comprehension").
  • Evolution’s logic is like geometry’s: in both relevant patterns and results arise from the intrinsic logic of the elements involved. In geometry, it’s lines, planes, etc. In evolution it’s kinetic functions like survival, varying replication, and adaptation.
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    I found this article very interesting. Evolution does not happen physically. There is also evolution in the social behavior and relationship in a specie. Even simple organisms like single-celled bacteria have certain behaviors that suggest evolution in "social behavior" even though they don't have brain or intelligence. I feel like it is just like the hydrogen bonds in chemistry that it forms naturally without a doubt. Common good is the ultimate goal of the nature. I think the logic is evolution is very amazing as all the results are because of mindless discovery. --Sissi (3/30/2017)
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