Medicine

Parents Who Don't Vaccinate Kids Tend To Be Affluent, Better Educated (go.com) 411

schwit1 quotes ABC News: Vaccines are universally backed by respected scientists and federal agencies, but that isn't enough to convince every parent to vaccinate their children. The decision to fly in the face of near universal scientific opinion doesn't come as a result of a lack of intellect, however, as experts who have studied vaccines and immunology acknowledge that many parents who don't vaccinate their children are well-educated. They also appear to be the victims of a widespread misinformation campaign, the experts said.

Daniel Salmon, who is the director of the Institute of Vaccine Safety at Johns Hopkins University, said that existing research suggests that there are some common attributes that many parents who choose not to vaccinate their children share. "They tend to be better educated. They tend to be white, and they tend to be higher income. They tend to have larger families and they tend to use complementary and alternative medicine like chiropractors and naturopaths," Salmon said.

Salman also says outbreaks typically start when an American returns from a visit to Europe, where there are much higher rates of measles than in the U.S. But lower vaccination rates help it spread.

One study in August reported Russian trolls "seem to be using vaccination as a wedge issue, promoting discord in American society," though their campaign on Twitter failed to gain traction.

"I blame Amazon Prime," writes long-time Slashdot reader destinyland. "That 'misinformation' they're talking about is the pseudoscience documentary Vaxxed -- and Amazon is one of the top site's pushing it. The movie is not only free for all Prime members -- Amazon's actually featuring it on the front page showing free-with-Prime movies."
Science

Physicists Made a Flying Army of Laser 'Schrodinger's Cats' (livescience.com) 58

PolygamousRanchKid quotes LiveScience: A laser pulse bounced off a rubidium atom and entered the quantum world -- taking on the weird physics of "Schrodinger's cat." The laser pulses didn't grow whiskers or paws. But they became like the famous quantum-physics thought experiment Schrodinger's cat in an important way: They were large objects that acted like the simultaneously dead-and-alive creatures of subatomic physics -- existing in a limbo between two simultaneous, contradictory states.

"In our experiment, the [laser cat] was sent to the detector immediately, so it was destroyed right after its creation," said Bastian Hacker, a researcher at the Max Planck Institute of Quantum Optics in Germany, who worked on the experiment. But it didn't have to be that way, Hacker told Live Science. "An optical state can live forever. So if we had sent the pulse out into the night sky, it could live for billions of years in its [cat-like] state." That longevity is part of what makes these pulses so useful, he added. A long-lived laser cat can survive long-term travel through an optical fiber, making it a good unit of information for a network of quantum computers... In the new experiment, described in a paper published Jan. 14 in the journal Nature Photonics, researchers created laser pulses that are in superposition between two possible quantum states. They called the little pulses "flying optical cat states...."

"Cat states can encode quantum information in a way that allows [us] to detect optical loss and correct for it. Although every optical transmission has losses, the information can be transmitted perfectly."

Software

Modern Weather Forecasts Are Stunningly Accurate (theatlantic.com) 153

An anonymous reader quotes a report from The Atlantic: Meteorologists have never gotten a shiny magazine cover or a brooding Aaron Sorkin film, and the weather-research hub of Norman, Oklahoma, is rarely mentioned in the same breath as Palo Alto. But over the past few decades, scientists have gotten significantly -- even staggeringly -- better at predicting the weather. How much better? "A modern five-day forecast is as accurate as a one-day forecast was in 1980," says a new paper, published last week in the journal Science. "Useful forecasts now reach nine to 10 days into the future." "Modern 72-hour predictions of hurricane tracks are more accurate than 24-hour forecasts were 40 years ago," the authors write. The federal government now predicts storm surge, stream level, and the likelihood of drought. It has also gotten better at talking about its forecasts: As I wrote in 2017, the National Weather Service has dropped professional jargon in favor of clear, direct, and everyday language. "Everybody's improving, and they're improving a lot," says Richard Alley, an author of the paper and a geoscientist at Penn State.

Understanding months-long events like El Niño, for instance, has allowed meteorologists to go beyond the seven-day forecast. Alley, the Penn State professor, says that he is awed by the new models. Well-studied features of Earth's climate -- like the temperate Gulf Stream in the Atlantic Ocean -- emerge in computer models, even though developers have written code that only mimics basic physics. We are now surrounded by the products of these miraculous models. In 2009, a back-of-the-envelope study estimated that U.S. adults check the weather forecast about 300 billion times per year. Perhaps in all that checking we have forgotten how strange the forecast is, how almost supernatural it is that people can describe the weather before it happens. More than 1,000 years ago, the Spanish archbishop Agobard of Lyon argued that no witch could control the weather because only God could understand it. "Man does not know the paths of the clouds, nor their perfect knowledges," he wrote. He cited the Book of Job for authority, which asks: "Dost thou know when God caused the light of his cloud to shine? Dost thou know the balancings of the clouds ?"

Medicine

New US Experiments Aim To Create Gene-Edited Human Embryos (npr.org) 87

An anonymous reader quotes a report from NPR: A scientist in New York is conducting experiments designed to modify DNA in human embryos as a step toward someday preventing inherited diseases, NPR has learned. For now, the work is confined to a laboratory. But the research, if successful, would mark another step toward turning CRISPR, a powerful form of gene editing, into a tool for medical treatment. Dieter Egli, a developmental biologist at Columbia University, says he is conducting his experiments "for research purposes." He wants to determine whether CRISPR can safely repair mutations in human embryos to prevent genetic diseases from being passed down for generations. So far, Egli has stopped any modified embryos from developing beyond one day so he can study them. "Right now we are not trying to make babies. None of these cells will go into the womb of a person," he says. But if the approach is successful, Egli would likely allow edited embryos to develop further to continue his research. Egli's research is reviewed in advance and overseen by a panel of other scientists and bioethicists at Columbia. Specifically, Egli is trying to fix one of the genetic defects that cause retinitis pigmentosa, an inherited form of blindness. "If it works, the hope is that the approach could help blind people carrying the mutation have genetically related children whose vision is normal," reports NPR.
Privacy

One of the Biggest At-Home DNA Testing Companies Is Working With the FBI (buzzfeednews.com) 106

An anonymous reader quotes a report from BuzzFeed News: Family Tree DNA, one of the largest private genetic testing companies whose home-testing kits enable people to trace their ancestry and locate relatives, is working with the FBI and allowing agents to search its vast genealogy database in an effort to solve violent crime cases, BuzzFeed News has learned. Federal and local law enforcement have used public genealogy databases for more than two years to solve cold cases, including the landmark capture of the suspected Golden State Killer, but the cooperation with Family Tree DNA and the FBI marks the first time a private firm has agreed to voluntarily allow law enforcement access to its database. While the FBI does not have the ability to freely browse genetic profiles in the library, the move is sure to raise privacy concerns about law enforcement gaining the ability to look for DNA matches, or more likely, relatives linked by uploaded user data.

The Houston-based company, which touts itself as a pioneer in the genetic testing industry and the first to offer a direct-to-consumer test kit, disclosed its relationship with the FBI to BuzzFeed News on Thursday, saying in a statement that allowing access "would help law enforcement agencies solve violent crimes faster than ever." While Family Tree does not have a contract with the FBI, the firm has agreed to test DNA samples and upload the profiles to its database on a case-by-case basis since last fall, a company spokesperson told BuzzFeed News. Its work with the FBI is "a very new development, which started with one case last year and morphed," she said. To date, the company has cooperated with the FBI on fewer than 10 cases. The Family Tree database is free to access and can be used by anyone with a DNA profile to upload, not just paying customers.

Science

Plants and Animals Sometimes Take Genes From Bacteria, Study Suggests (sciencemag.org) 44

An anonymous reader quotes a report from Science Magazine: Many genome studies have shown that prokaryotes—bacteria and archaea -- liberally swap genes among species, which influences their evolution. The initial sequencing of the human genome suggested our species, too, has picked up microbial genes. But further work demonstrated that such genes found in vertebrate genomes were often contaminants introduced during sequencing. [...] Debashish Bhattacharya, an evolutionary genomicist at Rutgers University in New Brunswick, New Jersey, and UD plant biochemist Andreas Weber took a closer look at a possible case of bacteria-to-eukaryote gene transfer that [William Martin, a biologist that concluded that there is no significant ongoing transfer of prokaryotic genes into eukaryotes, has challenged in 2015]. The initial sequencing of genomes from two species of red algae called Cyanidiophyceae had indicated that up to 6% of their DNA had a prokaryotic origin. These so-called extremophiles, which live in acidic hot springs and even inside rock, can't afford to maintain superfluous DNA. They appear to contain only genes needed for survival. "When we find a bacterial gene, we know it has an important function or it wouldn't last" in the genome, Bhattacharya says.

He and Weber turned to a newer technology that deciphers long pieces of DNA. The 13 red algal genomes they studied contain 96 foreign genes, nearly all of them sandwiched between typical algal genes in the DNA sequenced, which makes it unlikely they were accidentally introduced in the lab. "At the very least, this argument that [putative transferred genes are] all contamination should finally be obsolete," says Gerald Schoenknecht, a plant physiologist at Oklahoma State University in Stillwater. The transferred genes seem to transport or detoxify heavy metals, or they help the algae extract nourishment from the environment or cope with high temperature and other stressful conditions. "By acquiring genes from extremophile prokaryotes, these red algae have adapted to more and more extreme environments," Schoenknecht says.
While Martin says the new evidence doesn't persuade him, several insect researchers say they see evidence of such gene transfer. "I've moved beyond asking 'if [the bacterial genes] are there,' to how they work," says John McCutcheon, a biologist at Montana State University in Missoula who studies mealy bugs. The red algae, he adds, "is a very clear case."
Medicine

University of Columbia Researchers Translate Brain Signals Directly Into Speech (columbia.edu) 84

dryriver writes: There is good news for people who have limited or no ability to speak, due to having suffered a stroke for example. Researchers at Columbia University have managed to turn brain signals in the auditory cortex of test subjects into somewhat intelligible speech using a vocoder-like system with audio output cleaned up by neural networks. The findings have been published in the journal Nature. Here's an excerpt from the Zuckerman Institute's press release, which contains example audio of a number sequence being turned into robotic speech: "In a scientific first, Columbia neuroengineers have created a system that translates thought into intelligible, recognizable speech. By monitoring someone's brain activity, the technology can reconstruct the words a person hears with unprecedented clarity. This breakthrough, which harnesses the power of speech synthesizers and artificial intelligence, could lead to new ways for computers to communicate directly with the brain. It also lays the groundwork for helping people who cannot speak, such as those living with amyotrophic lateral sclerosis (ALS) or recovering from stroke, regain their ability to communicate with the outside world."
Power

Scientists Create Super-Thin 'Sheet' That Could Charge Our Phones (theguardian.com) 116

An anonymous reader quotes a report from The Guardian: Scientists at Massachusetts Institute of Technology (MIT) have created super-thin, bendy materials that absorb wireless internet and other electromagnetic waves in the air and turn them into electricity. The lead researcher, Tomas Palacios, said the breakthrough paved the way for energy-harvesting covers ranging from tablecloths to giant wrappers for buildings that extract energy from the environment to power sensors and other electronics. Details have been published in the journal Nature. Palacios and his colleagues connected a bendy antenna to a flexible semiconductor layer only three atoms thick. The antenna picks up wifi and other radio-frequency signals and turns them into an alternating current. This flows into the molybdenum disulphide semiconductor, where it is converted into a direct electrical current. [M]olybdenum disulphide film can be produced in sheets on industrial roll-to-roll machines, meaning they can be made large enough to capture useful amounts of energy.

Ambient wifi signals can fill an office with more than 100 microwatts of power that is ripe to be scavenged by energy-harvesting devices. The MIT system has an efficiency of between 30% and 40%, producing about 40 microwatts when exposed to signals bearing 150 microwatts of power in laboratory tests. "It doesn't sound like much compared with the 60 watts that a computer needs, but you can still do a lot with it," Palacios said. "You can design a wide range of sensors, for environmental monitoring or chemical and biological sensing, which operate at the single microwatt level. Or you could store the electricity in a battery to use later."

Medicine

Giving the Humble Stethoscope an AI Upgrade Could Save Millions of Kids (ieee.org) 82

the_newsbeagle writes: The stethoscope is a ubiquitous medical tool that has barely changed since it was invented in the early 1800s. But now a team of engineers, doctors, and public health researchers have come together to reinvent the tool using adaptive acoustics and AI. Their motivation is this statistic: Every year, nearly 1 million kids die of pneumonia around the world, with most deaths in sub-Saharan Africa and South Asia. The death toll is highest among children under the age of 5. The researchers, from Johns Hopkins University, designed a smart stethoscope for use by unskilled workers in noisy medical clinics. It uses a dynamic audio filtering system to remove ambient noise and distracting body sounds while not interfering with the subtle sounds from the lungs. And it uses AI to analyze the cleaned-up signal and provide a diagnosis.
Medicine

Mind-Altering Cat Parasite Linked To Schizophrenia in Largest Study Yet (sciencealert.com) 116

Scientists claim they have found new evidence of a link between infection with the protozoan parasite, Toxoplasma gondii, and schizophrenia, in what is described as the largest study of its kind. From a report: T. gondii, a brain-dwelling parasite estimated to be hosted by at least 2 billion people around the world, doesn't create symptoms in most people who become infected -- but acute cases of toxoplasmosis can be dangerous. Healthy adults are generally thought to not be at risk from T. gondii infections, but children or people with suppressed immune systems can develop severe flu-like symptoms, in addition to blurred vision and brain inflammation.

Pregnant women need to be careful too, as the parasite can cause foetal abnormalities or even miscarriage. Aside from the known physiological dangers, however, the stranger and more ambiguous risks associated with the parasite remain largely hypothetical -- although a huge body of research suggests something weird is going on. Causation remains very much disputable, but the brain-dwelling parasite -- commonly carried by cats and present in their faeces -- has been linked to a huge host of behaviour-altering effects.

Virtually all warm-blooded animals are capable of being infected, and when T. gondii gets inside them, unusual things happen. In rodents, animals seemingly lose their inhibitions, becoming more exploratory and losing their aversion to cat odours.

NASA

NASA Is Back To Work, But the Effects of the Government Shutdown Linger (theverge.com) 115

Following a record 35-day government shutdown, thousands of civil servants and contractors are heading back to work this week at NASA's various centers throughout the country. "These first few days back on the job will be consumed with practical matters, such as figuring out employee backpay and how to dive back into projects," reports The Verge. "The shutdown will undoubtedly result in delays for some of NASA's long-term programs, too, but it'll be a while before the space agency can fully assess the extent of the damage." From the report: To explain how NASA is adjusting in the wake of the shutdown, the space agency's administrator Jim Bridenstine addressed employees during a town hall meeting this afternoon at NASA's headquarters in Washington, DC. "Welcome to 2019," he said during the meeting, which was live-streamed on NASATV. "NASA is now open and we're very thankful for that." The comment was met by applause from those in attendance, while Bridenstine went on to acknowledge that it's been a rough start to the year for the agency. "I want to say thank you for your patience and for your commitment to this agency and to the mission we all believe in so dearly."

Bridenstine told the room that some NASA employees did leave during the shutdown, though it wasn't a substantial amount. "We didn't have a mass exodus," he said. "I think had this gone on longer, we would have. But we did lose people -- onesies and twosies -- across the agency and even here at headquarters. That is absolutely true." Perhaps those hit hardest at NASA were the agency's contractors. [...] Each company funded by NASA has its own contract with the agency, and the provisions of those agreements differ from contract to contract. Some contractors were paid their funding in advance of the shutdown, allowing them to continue working mostly unfazed. However, the employees of contractors who did not receive funding in advance were unable to bill for the hours that they worked during the shutdown. And it's possible they'll never receive compensation for that time.
"NASA is in the middle of selecting new planetary missions to pursue, as part of its New Frontiers and Discovery programs -- and the shutdown may have delayed that process, says Casey Dreier, chief advocate and senior space policy adviser at The Planetary Society," reports The Verge. "Thomas Zurbuchen, NASA's associate administrator for science, pushed back the date for when the agency would accept applications for new science research proposals. And there's uncertainty surrounding the new giant rocket NASA is working on to take astronauts to the Moon and beyond, called the Space Launch System." Boeing told Politico that the shutdown delayed testing of the rocket's hardware.
Science

Study Shows How LSD Interferes With Brain's Signaling (theguardian.com) 63

An anonymous reader quotes a report from The Guardian: A group of volunteers who took a trip in the name of science have helped researchers uncover how LSD messes with activity in the brain to induce an altered state of consciousness. Brain scans of individuals high on the drug revealed that the chemical allows parts of the cortex to become flooded with signals that are normally filtered out to prevent information overload. The drug allowed more information to flow from the thalamus, a kind of neural gatekeeper, to a region called the posterior cingulate cortex, and it stemmed the flow of information to another part known as the temporal cortex. This disruption in communication may underpin some of the wacky effects reported by LSD users, from feelings of bliss and being at one with the universe to hallucinations and what scientists in the field refer to as "ego dissolution," where one's sense of self disintegrates.

For the study, the researchers invited 25 healthy participants into the lab to be scanned under the influence of LSD and, on another occasion, after taking a placebo. They were shown around the scanner beforehand to ensure they felt comfortable going inside when the drug took hold. Had the machine suddenly taken on a threatening demeanor, the scans might not have come out so well. The scientists wanted to test a hypothesis first put forward more than a decade ago. It states LSD causes the thalamus to stop filtering information it relays to other parts of the brain. It is the breakdown of this filter that gives rise to the weird effects the drug induces, or so the thinking goes. Scans of the volunteers' brains suggested there may be some truth to the hypothesis. On LSD, the thalamus let more information through to some parts of the brain and suppressed information bound for others. "What we found is that the model is mostly true, but how information is distributed to the cortex under LSD is much more specific than it predicts," a researcher said.
The latest research is published in Proceedings of the National Academy of Sciences.
China

China Will Attempt 30-Plus Launches in 2019, Including Crucial Long March 5 Missions (spacenews.com) 64

New submitter starmanaj shares a report: The main contractor for the Chinese space program is planning more than 30 launches in 2019, with major missions including the crucial return-to-flight of the heavy-lift Long March 5 rocket in July. The China Aerospace Science and Technology Corporation (CASC), announced Jan. 29 that it would aim to loft more than 50 spacecraft on 30-plus launches this year. Among these will be the third launch on the Long March 5, a 5-meter-diameter, 57-meter-tall heavy-lift launch vehicle which failed in its second flight in July 2017, delaying the Chang'e-5 lunar sample return mission and the construction of the Chinese Space Station. The mission will take place in July at the coastal Wenchang Satellite Launch Center on Hainan island, CASC vice president Yang Baohua said at a Jan. 29 news conference in Beijing, which also saw the release of a "Blue Book of China Aerospace Science and Technology Activities."
Communications

All-Photonic Quantum Repeaters Could Lead To a Faster, More Secure Global Quantum Internet (phys.org) 54

"University of Toronto Engineering professor Hoi-Kwong Lo and his collaborators have developed a prototype for a key element for all-photonic quantum repeaters, a critical step in long-distance quantum communication," reports Phys.Org. This proof-of-principle device could serve as the backbone of a future quantum internet. From the report: In light of [the security issues with today's internet], researchers have proposed other ways of transmitting data that would leverage key features of quantum physics to provide virtually unbreakable encryption. One of the most promising technologies involves a technique known as quantum key distribution (QKD). QKD exploits the fact that the simple act of sensing or measuring the state of a quantum system disturbs that system. Because of this, any third-party eavesdropping would leave behind a clearly detectable trace, and the communication can be aborted before any sensitive information is lost. Until now, this type of quantum security has been demonstrated in small-scale systems. Lo and his team are among a group of researchers around the world who are laying the groundwork for a future quantum Internet by working to address some of the challenges in transmitting quantum information over great distances, using optical fiber communication.

Because light signals lose potency as they travel long distances through fiber-optic cables, devices called repeaters are inserted at regular intervals along the line. These repeaters boost and amplify the signals to help transmit the information along the line. But quantum information is different, and existing repeaters for quantum information are highly problematic. They require storage of the quantum state at the repeater sites, making the repeaters much more error prone, difficult to build, and very expensive because they often operate at cryogenic temperatures. Lo and his team have proposed a different approach. They are working on the development of the next generation of repeaters, called all-photonic quantum repeaters, that would eliminate or reduce many of the shortcomings of standard quantum repeaters.
"We have developed all-photonic repeaters that allow time-reversed adaptive Bell measurement," says Lo. "Because these repeaters are all-optical, they offer advantages that traditional -- quantum-memory-based matter -- repeaters do not. For example, this method could work at room temperature."
Earth

The Natural Materials That Could Replace Environmentally Harmful Plastics (bbc.com) 65

"The BBC has an article detailing new efforts to replace plastics used in products and construction with newer, less environmentally harmful alternative materials," writes Slashdot reader dryriver. The new products mentioned in the report include: Stone Wool: To transform one of the world's most abundant resources into something with utility and sustainability takes a special kind of alchemy. Stone wool comes from natural igneous rock -- the kind that forms after lava cools -- and a steelmaking byproduct called slag; these substances are melted together and spun into fibers, a little like candyfloss.

Mycotecture: Mushrooms aren't just a flavor-packed addition to ravioli or ragu (or a sparkplug to the occasional psychedelic adventure); soon, tree-hugging fungi and forest-floor toadstools may replace materials like polystyrene, protective packaging, insulation, acoustic insulation, furniture, aquatic materials and even leather goods.

Urine Bricks: Cement, concrete's primary ingredient, accounts for about 5% of the world's carbon dioxide emissions. Researchers and engineers are working to develop less energy-intensive alternatives, including bricks made with leftover brewery grains, concrete modeled after ancient Roman breakwaters (Romans made concrete by mixing lime and volcanic rock to form mortar, a highly stable material), and bricks made of, well, urine. As part of his thesis project, Edinburgh College of Art student Peter Trimble was working on an exhibit that was supposed to feature a module on sustainability. Almost by accident, he created "Biostone": a mixture of sand (incidentally, one of Earth's most abundant resources), nutrients, and urea -- a chemical found in human urine.

A greener particleboard: Despite what it sounds like, particleboard -- those rigid panels made of compressed and veneered wood chips and resin used in furniture and kitchen cabinetry throughout the world -- hasn't actually a place in the green-building pantheon. That's because the glue that binds particleboard's wood fibers traditionally contain formaldehyde, a colorless, flammable, strong-smelling chemical and known respiratory irritant and carcinogen. That means your faux-wood Ikea shelf is quietly "off-gassing" toxins into the air. One company, NU Green, created a material made from 100% pre-consumer recycled or recovered wood fibre called "Uniboard." Uniboard saves trees and avoids landfill, while also generating far fewer greenhouse gases than traditional particleboard, and contains no toxins. That's because Uniboard has pioneered the use of renewable fibers like corn stalks and hops, as well as no added formaldehyde (NAF) resin instead of glue.

NASA

NASA Making Renewed Efforts To Contact Mars Rover Opportunity (spacenews.com) 70

NASA is making a new, and perhaps final, attempt to restore contact with the Mars rover Opportunity, which has not communicated with the Earth for more than six months. From a report: The Jet Propulsion Laboratory announced Jan. 25 that it was transmitting a new set of commands to address what it acknowledged are "low-likelihood" events that could have kept the rover from contacting Earth. These new efforts are in addition to the months-long "sweep and beep" campaign of transmitting other commands and listening for a reply from the rover.

The new commands address scenarios where the rover's primary X-band radio has failed or both the primary and backup X-band radios have failed, as well as cases where Opportunity's internal clock has an offset affecting its timing. The commands direct the rover to switch to the backup X-band radio or use its UHF transmitter to contact Earth, as well as resetting its clock. Those scenarios could explain why the rover has failed to contact Earth, but project officials acknowledge that those scenarios are unlikely. "A series of unlikely events would need to have transpired for any one of these faults to occur," JPL noted in the statement about the new campaign.

Power

World's Oldest Nobel Prize Winner Is Working On Light 'Concentrators' That May Give Everyone Clean, Cheap Energy (businessinsider.com) 156

A reader shares a report from Business Insider: Arthur Ashkin, the world's oldest Nobel Prize winner, [...] has turned the bottom floor of his house into a kind of laboratory where he's developing a solar-energy-harnessing device. Ashkin's new invention uses geometry to capture and funnel light. Essentially, it relies on reflective concentrator tubes that intensify solar reflections, which could make existing solar panels more efficient or perhaps even replace them altogether with something cheaper and simpler. The tubes are "dirt cheap," Ashkin says -- they cost just pennies to create -- which is why he thinks they "will save the world." He's even got his eye on a second Nobel Prize.

Ashkin's lifelong fascination with light has already saved countless lives. He shared the 2018 Nobel Prize in physics for his role in inventing a tiny object-levitating technology called optical tweezers, which is essentially a powerful laser beam that can "catch very small things," as Ashkin describes it. Optical tweezers can hold and stretch DNA, thereby helping us probe some of the biggest mysteries of life. [...] Ashkin has already filed the necessary patent paperwork (he holds at least 47 patents to date) for his new invention, but said he isn't ready to share photos of the concentrators with the public just yet. Soon, he hopes to publish his results in the journal Science.

Science

Neanderthals Were Likely Able To Hunt Over Significant Distances With Spears, Study Finds (nature.com) 150

dryriver writes: In the past, Neanderthal humans were believed to be largely close-distance hunters. A new paper in the journal Nature, based on actual outdoor tests with multiple test subjects throwing two wooden spears closely mimicking ancient spears found in various places at a target, surmises that spear throwing Neanderthals may in fact have been able to kill animals at distances of 60 feet or even greater. The authors found that targeting a wooden spear accurately at that distance takes skill, and even worked out the impact velocity of Neanderthal spears at such a distance. Nevertheless, Neanderthals with sufficient practice in spear throwing may very well have been capable of killing at distances far greater than previously thought. This changes the assumption that Neanderthals needed to get very close to animals in order to have a chance of killing them.
Medicine

Internet Addiction Spawns US Treatment Programs (reuters.com) 80

SpzToid shares a report from Reuters: When Danny Reagan was 13, he began exhibiting signs of what doctors usually associate with drug addiction. He became agitated, secretive and withdrew from friends. He had quit baseball and Boy Scouts, and he stopped doing homework and showering. But he was not using drugs. He was hooked on YouTube and video games, to the point where he could do nothing else. As doctors would confirm, he was addicted to his electronics. "After I got my console, I kind of fell in love with it," Danny, now 16 and a junior in a Cincinnati high school, said. "I liked being able to kind of shut everything out and just relax." Danny was different from typical plugged-in American teenagers. Psychiatrists say internet addiction, characterized by a loss of control over internet use and disregard for the consequences of it, affects up to 8 percent of Americans and is becoming more common around the world.

"We're all mildly addicted. I think that's obvious to see in our behavior," said psychiatrist Kimberly Young, who has led the field of research since founding the Center for Internet Addiction in 1995. "It becomes a public health concern obviously as health is influenced by the behavior." At first, Danny's parents took him to doctors and made him sign contracts pledging to limit his internet use. The "Reboot" program at the Lindner Center for Hope offers inpatient treatment for 11 to 17-year-olds who, like Danny, have addictions including online gaming, gambling, social media, pornography and sexting, often to escape from symptoms of mental illnesses such as depression and anxiety. âoeRebootâ patients spend 28 days at a suburban facility equipped with 16 bedrooms, classrooms, a gym and a dining hall. They undergo diagnostic tests, psychotherapy, and learn to moderate their internet use.

Medicine

LSD Changes Something About the Way People Perceive Time, Even At Microdoses (vice.com) 157

An anonymous reader quotes a report from Tonic: The perception of time is a fundamental process of the brain, linked tightly to attention, emotions, memory, psychiatric and neurological disorders, and even consciousness -- but while scientists have been anecdotally noting how drugs can change time perception for decades, very few have been able to address the question rigorously with tightly designed studies. Cognitive neuroscientist Devin Terhune says he's been interested in understanding the neurochemical mechanisms involved in the distortions in the perception of time, and these drugs are one way to do that. Psychedelics act on specific pathways and chemicals in the brain, and if they also change the perception of time, we could learn exactly how it happens. At the end of November, Terhune and his co-authors published a randomized, double-blind, placebo-controlled study in Psychopharmacology on the effects of microdoses of LSD on people's perception of time. They found that even at small doses, LSD seems to change the way people interpret time, though the specifics of how and when are still to be determined.

In the new work, 48 healthy people were split up into four groups. One group got a placebo, and the other three received different small doses of LSD: 5, 10, or 20 micrograms. Then, they did what's called a temporal reproduction task. In this task, you see something on a screen for a certain amount of time -- in the study it was a blue circle -- and are asked to remember and recreate how long you saw it. The participants were shown a blue circle for periods of time from 800 milliseconds all the way up to 4,000 milliseconds, in increments of 400 milliseconds. Terhune and his colleagues looked to see how accurate the different groups of people were in reproducing those intervals, and found that the people in the LSD groups tended to hold down the space bar for significantly longer periods of time than the placebo condition. The researchers call this "over-reproduction."
"Terhune says that they saw these changes in time perception without any major conscious effects from the drug," the report adds. "They asked people to report if they felt anything from taking the LSD, like perceptual distortions, unusual thoughts, if they felt high, or if it affected their concentration. There were a couple of weak effects, but statistically, the change in time perception happened independent of any subjective influence of the drug."

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