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A paper posted online last month has reignited a debate about one of the oldest, most startling claims in the modern era of network science: the proposition that most complex networks in the real world—from the World Wide Web to interacting proteins in a cell—are “scale-free.” Roughly speaking, that means that a few of their nodes should have many more connections than others, following a mathematical formula called a power law, so that there’s no one scale that characterizes the network.

Purely random networks do not obey power laws, so when the early proponents of the scale-free paradigm started seeing power laws in real-world networks in the late 1990s, they viewed them as evidence of a universal organizing principle underlying the formation of these diverse networks. The architecture of scale-freeness, researchers argued, could provide insight into fundamental questions such as how likely a virus is to cause an epidemic, or how easily hackers can disable a network.

Amazingly simple and far-reaching natural laws govern the structure and evolution of all the complex networks that surround us,” wrote Barabási (who is now at Northeastern University in Boston) in Linked. He later added: “Uncovering and explaining these laws has been a fascinating roller-coaster ride during which we have learned more about our complex, interconnected world than was known in the last hundred years.”

On the night before Halloween in 1938, a strange story crackled over radios across the United States. An announcer interrupted the evening’s regular programming for a “special bulletin,” which went on to describe an alien invasion in a field in New Jersey, complete with panicked eyewitness accounts and sounds of gunfire. The story was, of course, fake, a dramatization of The War of The Worlds, the science-fiction novel published by H. G. Wells in 1898. But not all listeners knew that. The intro to the segment was quite vague, and those who tuned in a few minutes into the show found no suggestion that what they were hearing wasn’t true.

The exact nature of the reaction of these unlucky listeners has been debated in the decades since the broadcast. Some say thousands of people dashed out of their homes and into the streets in terror, convinced the country was under attack by Martians. Others say there was no such mass panic. Regardless of the actual scale of the reaction, the event helped cement an understanding that would later be perpetuated in science-fiction television shows and films: Humans, if and when they encounter aliens, probably aren’t going to react well.

But what if the extraterrestrial life we confronted wasn’t nightmarish and intelligent, as it’s commonly depicted, but rather microscopic and clueless?

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

As the coronavirus that causes COVID-19 spreads in more than 60 countries, the race to develop a vaccine to prevent the illness has taken on new urgency. In a meeting with CEOs of major drug companies this week, President Trump ramped up the pressure, suggesting that vaccines could come to market faster than the 12- to 18-month timeline most researchers think is realistic.

But while the Trump administration is pushing drug companies to meet faster timelines, it hasn’t addressed an equally urgent question: What will be done to ensure the vaccine is accessible for those who need it most?

Making vaccines available only to the rich is not just immoral, it’s also bad public health policy. We’ll want everyone, rich or poor, insured or not, to be protected from the new coronavirus. Protecting others helps to protect everyone.

Mysterious fast radio bursts have been used to unlock another strange aspect of the universe: the case of the "missing matter."

Astronomers have yet to determine what causes these fast radio bursts, which are unpredictable but can be spotted and traced back to their origin using sensitive telescopes.

Normal matter, called baryonic matter in this study, is made of the protons and neutrons that comprise both humans and star stuff. But astronomers could only account for about half of it that should exist in the universe.

Darwin is operated through a Wi-Fi-enabled tablet that resembles an iPad and displays metrics on conditions across the home. Properties with the system are constructed with air quality sensors and filters that detect and remove impurities like pollution and smoke. They also have water purifiers that get rid of chlorine, heavy metals and other particles from tap water.

“We’re indoors for most of our lives, and while we may not be able to change that, Darwin gives you the ability to change your environment,” he said.

Not many are equipped with such high-tech systems as Darwin, but these communities offer wellness in other ways: growing produce for residents, for example, or providing outdoor space and fitness classes.

Five exoplanets and eight planet candidates have been found around nearby stars, including a "cold Neptune" and two super-Earths that are potentially habitable, according to a new study. The two super-Earths, GJ180d and GJ229Ac, were found around small red dwarf stars that are 19 and 40 light-years away from our sun, while the cold Neptune was found around a similar star that's 29.5 light-years away.

Meanwhile, the other super-Earth, GJ229Ac, is the nearest temperate super-Earth in a system where the host star is also orbited by a brown dwarf. Brown dwarfs are known as failed stars that can't sustain the hydrogen fusion needed to power them

"GJ 433 d is the nearest, widest and coldest Neptune-like planet ever detected," said Fabo Feng, lead study author and astronomer at the Carnegie Institution for Science. A multitude of exoplanets, especially terrestrial planets like Earth, have been found around red dwarf stars. They're smaller and cooler than our sun, and they're the most common star in our galaxy. Exoplanets tend to orbit closer to these stars and still be within the star's habitable zone, or the perfect distance for the planet to be temperate and potentially host liquid water on their surfaces.

Various studies point to the conclusion that subjecting the mind to formal discipline — as when studying geometry or Latin — does not, in general, engender a broad transfer of learning. There is no sweeping increase of a general capacity for tasks like writing a speech or balancing a checkbook.

Many reasons have been advanced for this poor showing, including the lack of relevance of such an abstract exercise to people’s daily lives.

Most people reflexively eliminate the cards not explicitly specified in the rule (the F and the 2) and then continue with slower, more analytic processing only for the E and the 5. In this, they rely on an initial snap judgment about superficial similarity, a tendency that some scholars speculate evolved in humans because in most real-world contexts, quickly detecting such similarities is a good strategy for survival.

he main reason is that a test gives information about the level of the virus at one point in time. A person could be infected but not have enough virus yet for it to register on a test. Or, a person may become infected in the hours or days after taking a test. Also, the tests do not have 100 percent accuracy.

A test “filters out those who are positive and definitely shouldn’t be there,” she said. “Testing negative basically changes nothing about behavior. It still means wear a mask, distance, avoid indoors if you can.”

Taking multiple tests over a period of days gives a clearer answer. But experts cautioned that no test — regardless of how many times it’s taken in succession — can definitively determine whether someone infected by the coronavirus is contagious, or no longer poses a transmission risk to other people.

When it comes to the human brain, scientists still have a lot left to learn. One function that remains mysterious? How we're able to interpret two-dimensional pictures—like a picture of a cat on a computer screen—into objects we recognize from real life. In order to learn more about this process, researchers from the University of Washington have found a way to use brain implants and advanced software to decode brain signals at nearly the speed of thought.

The electrodes in their brains were hooked up to a software that had been programmed to detect two specific brain signal properties: "event-related potentials" that occur in immediate response to an image and "broadband spectral changes" that linger after an image has already been seen. By digitizing brain signals at a rate of 1000 times per second, the software was able to pinpoint which combination of electrode locations and signals best matched the image the patients saw in front of them.

The challenges for alternative gravity theories—collectively known as modified Newtonian dynamics, or MOND—were spelled out in a separate preprint coincidentally published the day after the new model appeared. Chief among them is recasting the leading role dark matter plays in drawing the universe together, as described by a well-established cosmological model known as LCDM, or Lambda cold dark matter.

Simply put, LCDM says that we wouldn’t be here without dark matter. The infant universe was so smooth that the gravitational attraction of ordinary matter alone wouldn’t have been enough to gather particles into galaxies, stars, and planets. Enter dark-matter particles. Under the LCDM model, their collective bulk sculpts normal matter into the modern cosmic structures studied by astronomers.

LCDM became the standard model of cosmology in part because it so precisely agrees with the CMB. This map of the early universe shows almost imperceptibly thick and thin spots rippling through the cosmos. More recently, researchers have been able to measure the orientation or polarization of the CMB’s light more precisely. Any successful cosmology will need to establish a comprehensive history of the cosmos by reproducing these three observations: the CMB’s temperature, the CMB’s polarization, and the current distribution of galaxies and galaxy clusters.

In a landmark trial, a cocktail of immunotherapy medications harnessed patients’ immune systems to kill their own cancer cells and prompted “a positive trend in survival”, according to researchers at the Institute of Cancer Research (ICR), London, and the Royal Marsden NHS foundation trust.

Scientists found the combination of nivolumab and ipilimumab medications led to a reduction in the size of tumours in terminally-ill head and neck patients. In some, their cancer vanished altogether, with doctors stunned to find no detectable sign of disease.

the immunotherapy treatment also triggered far fewer side-effects compared with the often gruelling nature of “extreme” chemotherapy,

Personality traits that are shaped by genetics and early life experiences strongly influence our Covid-19-related decisions, studies from the U.S. and Japan have found.

In a study of more than 400 U.S. adults, Dr. Byrne and her colleagues found that how people perceive risks, whether they make risky decisions, and their preference for immediate or delayed rewards were the largest predictors of whether they followed public-health guidelines when it came to wearing masks and social distancing.

These factors accounted for 55% of the difference in people’s behaviors—more than people’s political affiliation, level of education or age.

Everyone—even the most privileged among us—has circumstances they would like to change in their life.

How might you improve the situation? Your answer might be, “I should move, get a new job, and meet new people.” In other words, you should change the outside world to make it better for you.

Between the conditions around you and your response to them is a space. In this space, you have freedom. You can choose to try remodeling the world, or you can start by changing your reaction to it.

For decades, scientists working to predict changes in the climate relied mostly on calculations involving simple laws of physics and chemistry but little data from the real world. But with temperatures world-wide continuing to rise—and with data-collection techniques and technologies continuing to advance—scientists now rely on meticulous measurements of temperatures, ocean currents, soil moisture, air quality, cloud cover and hundreds of other phenomena on Earth and in its atmosphere.

“Now we can truly do climate studies because now we have observations to precisely say how weather trends have changed and are changing,

“When you are trying to develop long-term environmental records, including climate records, consistent measurement is incredibly valuable,” says Kevin Murphy, who as NASA’s chief science data officer oversees an archive of Earth observation data used by 3.9 million people last year. “It’s irreplaceable data.”

Could technology companies have monitored ominous messages made by a gunman who Texas authorities say massacred 19 children and two teachers at an elementary school? Could they have warned the authorities? Answers to these questions remain unclear

But if nothing else, the shooting in Uvalde, Texas, seems highly likely to focus additional attention on how social platforms monitor what users are saying to and showing each other.

Shortly thereafter, Facebook stepped in to note that the gunman sent one-to-one direct messages, not public posts, and that they weren’t discovered until “after the terrible tragedy”.

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.