|Piled Higher & Deeper by Jorge Cham||
At present, the Voyager 1 spacecraft is 21 billion kilometers from Earth, or about 141 times the distance between the Earth and Sun. It has, in fact, moved beyond our Solar System into interstellar space. However, we can still communicate with Voyager across that distance.
This week, the scientists and engineers on the Voyager team did something very special. They commanded the spacecraft to fire a set of four trajectory thrusters for the first time in 37 years to determine their ability to orient the spacecraft using 10-millisecond pulses.
After sending the commands on Tuesday, it took 19 hours and 35 minutes for the signal to reach Voyager. Then, the Earth-bound spacecraft team had to wait another 19 hours and 35 minutes to see if the spacecraft responded. It did. After nearly four decades of dormancy, the Aerojet Rocketdyne manufactured thrusters fired perfectly.
To the best of our ability to tell, everything on Earth shares a few common features. It encodes information in DNA using four bases, A, T, C, and G. Sets of three consecutive bases are used to code for a single amino acid, and most organisms use a set of 20 amino acids to build proteins. These features appear everywhere, from plants and animals to bacteria and viruses, suggesting that they appeared in the last common ancestor of life on Earth.
This raises a question that comes up a lot in evolutionary studies: are these features used because they're in some way efficient, or did we end up stuck with them as a result of some historic accident?
A team of California-based researchers has been building an argument that it's an accident. And it's doing so by expanding life beyond the limitations inherited from its common ancestor. After having expanded the genetic alphabet to six letters, the team has now engineered a bacterial strain that uses the extra letters to put an unnatural amino acid into proteins.
Thunderstorms have a lot of overt indications of power, from the thunder and lightning to torrential rains and hail. But the full extent of their power wasn't obvious until recent years, when we discovered they generate antimatter. Now, researchers in Japan have looked at this phenomenon more closely and determined that a lightning bolt generates a zone that contains unstable isotopes of oxygen and nitrogen, leading to series of radioactive decays over the next minute.
All of these phenomena are powered by the fact that the electric fields within thunderstorms are able to accelerate electrons to extremely high energies. Whenever these electrons move along a curved path, they emit radiation that's proportional to their energy. As a result, a storm can be associated with bursts of gamma rays, extremely high-energy photons.
Gamma rays rays are primarily noted for their interaction with the electrons of any atoms they run into—it's why they're lumped in the category of ionizing radiation. But they can also interact with the nucleus of the atom. With sufficient energy, they can kick out a neutron from some atoms, transforming them into a different isotope. Some of the atoms this occurs with include the most abundant elements in our atmosphere, like nitrogen and oxygen. And, in fact, elevated neutron detections had been associated with thunderstorms in the past.
Mars clearly had extensive water in the past, and there's still plenty of it locked up as ice in glaciers and the polar ice caps. But the atmosphere is too thin and cold to allow liquid water to exist on the surface, which makes prospects for life on the Red Planet far less likely.
Back in 2011, however, researchers suggested that, contrary to our expectations, there might still be some water seeping out onto Mars' surface. Darkened features were identified on a variety of slopes, and they seemed to appear during warmer seasons and vanish as temperatures plunged again. The Mars Reconnaissance Orbiter appeared to detect water at the site. But other researchers proposed a physical mechanism that didn't involve water that could account for the seasonal changes.
Now, a review of the evidence in Nature Geoscience argues that there are problems with almost all of the potential causes for these seasonal features. And, in the absence of a compelling case for water, it's best to assume that the harsh conditions mean what we typically thought they did: Mars is a dry planet.
Since mid-October, the astronomy community has been buzzing about what might be our Solar System’s first confirmed interstellar visitor. An automated telescope spotted an object that appeared as if it had been dropped on the Solar System from above, an angle that suggests it arrived from elsewhere. Now, a team of astronomers has rushed out a paper that describes the object's odd properties and gives it the name “1I/2017 U1 ‘Oumuamua.” In Hawaiian, ‘Oumuamua roughly means “first messenger,” and the 1I indicates that it’s the first interstellar object.
‘Oumuamua was first spotted on October 19 by the Pan-STARRS1 automated telescope system. Pan-STARRS1 turned out to have captured images of the object the day previously, but the automated analysis software hadn’t identified it. Further images over the next few days allowed researchers to refine its travel through our Solar System, confirming that ‘Oumuamua was making the most extreme approach toward the inner Solar System of any object we’ve ever seen. In essence, it appeared to have been dropped onto the Solar System from above, plunging between the Sun and the orbit of Mercury. It was also moving extremely quickly.
The Solar System was formed from a flattened disk of material, and all of the planets orbit roughly in the plane of that disk. Smaller objects, like dwarf planets and comets, may take somewhat more erratic approaches with orbits tilted out of that plane, but they still roughly aligned with it. We had literally never seen anything like ‘Oumuamua.
The tasty Japanese seaweed nori is ubiquitous today, but that wasn't always true. Nori was once called “lucky grass” because every year's harvest was entirely dependent on luck. Then, during World War II, luck ran out. No nori would grow off the coast of Japan, and farmers were distraught. But a major scientific discovery on the other side of the planet revealed something unexpected about the humble plant and turned an unpredictable crop into a steady and plentiful food source.
Nori is most familiar to us when it's wrapped around sushi. It looks less familiar when floating in the sea, but for centuries, farmers in Japan, China, and Korea knew it by sight. Every year, they would plant bamboo poles strung with nets in the coastal seabed and wait for nori to build up on them.
At first it would look like thin filaments. Then, with luck, it grew into healthy, harvestable plants with long, green leaves. The farmers never saw seeds or seedlings, so no one could cultivate it. The filaments simply appeared every year. That is, they appeared until after World War II, when pollution, industrialization along the coast, and a series of violent typhoons led to a disastrous drop in harvests. By 1951, nori production in Japan had been all but wiped out.
Your next romp with a paramour may blow your mind, but it’s unlikely to stop your heart, according to research presented this weekend at the American Heart Association’s Scientific Sessions 2017 in Anaheim, California.
That’s the good news. The bad news is that if you do suffer cardiac arrest from an amorous encounter, there’s a decent chance your partner will just let you croak.
In an analysis of 4,557 adult cases of cardiac arrest in a Northwestern US community between 2002 and 2015, only 34 of them occurred during or within an hour of sexual intercourse. Of those, 32 were in men. That means that sex is linked to only about one in a hundred cases of cardiac arrest in men. For women, the rate is around one in a thousand.
First came the $15 million fine a New York federal judge imposed on Sci-Hub, a scientific research piracy site that has freed tens of thousands of research papers from behind paywalls. That was in June, and the site's overseas operator, Alexandra Elbakyan, said she'd never pay plaintiff Elsevier or stop the infringing behavior.
Now on Friday, a Virginia federal judge dinged the site for another $4.8 million for the same infringing behavior, this time from a lawsuit brought by the American Chemical Society.
The latest Friday order (PDF), like the previous order (PDF), demands that domain providers stop servicing Sci-Hub. The site has been playing a game of domain Whac-a-Mole for years in a bid to skirt US judicial orders.
Though the Great Pyramid at Giza in Egypt is one of the ancient world's biggest and most elaborate monuments, we still know very little about how it was constructed. We also don't know how many chambers are hidden inside it. Now, an international research team has identified what appears to be a large empty space or void above the pyramid's famed "Grand Gallery." The scientists report in the journal Nature that they used a cutting-edge technique for detecting cosmic radiation to make their discovery.
The Pharaoh Khufu (2509-2483 BCE) ordered the Great Pyramid to be built at Giza roughly 4,500 years ago. The structure remained sealed until 820 CE, when the Caliph al-Ma'mun broke open one of its walls and discovered three chambers inside, arranged vertically. These chambers are connected by the "Grand Gallery," a large corridor. Since that time, many have tried to find additional rooms and failed. Part of the problem is that we have no remaining plans for the pyramid's design, so it's impossible to know where to look. Plus, archaeologists today can't explore the pyramid using invasive techniques that might damage the structure. So explorers have to get creative. That's why Heritage Innovation Preservation Institute's (HIP) Mendhi Tayoubi organized a team of engineers and physicists who would use cosmic radiation to map the interior of the pyramid to look for empty spaces.
While artificial intelligence software has made huge strides recently, in many cases, it has only been automating things that humans already do well. If you want an AI to identify the Higgs boson in a spray of particles, for example, you have to train it on collisions that humans have already identified as containing a Higgs. If you want it to identify pictures of cats, you have to train it on a database of photos in which the cats have already been identified.
(If you want AI to name a paint color, well, we haven't quite figured that one out.)
But there are some situations where an AI can train itself: rules-based systems in which the computer can evaluate its own actions and determine if they were good ones. (Things like poker are good examples.) Now, a Google-owned AI developer has taken this approach to the game Go, in which AIs only recently became capable of consistently beating humans. Impressively, with only three days of playing against itself with no prior knowledge of the game, the new AI was able to trounce both humans and its AI-based predecessors.
Jeffrey Tsang is a sailor on a cargo ship. On a recent voyage from the Red Sea to Sri Lanka to Singapore to Hong Kong, he set up a camera facing the bow of the ship to record the month-long journey. From ~80,000 photos taken, he constructed a 10-minute time lapse that somehow manages to be both meditative and informative. You get to see cargo operations at a few different ports, sunrises, thunderstorms, and the clearest night skies you’ve ever seen. Highly recommended viewing. (via colossal)Tags: time lapse video
Crowdfunding for the Purism 5 Linux phone has soared past $200,000 — and is on course to succeed.
This post, Linux Phone Crowdfunder Hits $200k, Is ‘Ahead of Trend Line to Succeed’, was written by Joey Sneddon and first appeared on OMG! Ubuntu!.
Tiny bits of plastic commonly come rushing out of water taps around the world, according to a new survey of 159 water samples collected from more than a dozen nations.
Overall, 83 percent of the 159 samples contained some amount of microplastics. Those samples came from various places in the US, Europe, Indonesia, Uganda, Beirut, India, and Ecuador. No country was without a plastic-positive water sample. In fact, after testing a handful of samples from each place, the lowest contamination rate was 72 percent. The highest—found in the US—was 94-percent positive rate.
The microplastic pieces found are tiny, as small as 2.5 micrometers in size. The amounts were tiny, too. When researchers looked at the average number of plastic bits per 500mL water sample in each nation, the highest average was from US water samples—with 4.8 plastic scraps per sample. A sample taken from the US Capitol had 16 plastic fragments in it, for instance. The lowest average was 1.9 microplastic shards per 500mL sample, seen in those from Indonesia and Europe.
Photo © Dag Peak. San Martin, Buenos Aires.
Crown shyness is a naturally occurring phenomenon in some tree species where the upper most branches in a forest canopy avoid touching one another. The visual effect is striking as it creates clearly defined borders akin to cracks or rivers in the sky when viewed from below. Although the phenomenon was first observed in the 1920s, scientists have yet to reach a consensus on what causes it. According to Wikipedia it might simply be caused by the trees rubbing against one another, although signs also point to more active causes such as a preventative measure against shading (optimizing light exposure for photosynthesis) or even as a deterrent for the spread of harmful insects. (via Kottke, Robert Macfarlane)
Cheers!—not to your health, but to your memory.
Drinking alcohol after learning information appears to aid the brain’s ability to store and remember that information later, according to a study of at-home boozing in Scientific Reports. The memory-boosting effect—which has been seen in earlier lab-based studies—linked up with how much a person drank: the more alcohol, the better the memory the next day.
The study authors, led by psychopharmacologist Celia Morgan of University of Exeter, aren’t sure why alcohol improves memory in this way, though. They went into the experiment hypothesizing that alcohol blocks the brain’s ability to lay down new memories, thus freeing up noggin power to carefully encode and store the fresh batch of memories that just came in. In other words, after you start drinking, your ability to remember new things gets wobbly, but your memory of events and information leading up to that drink might be sturdier than normal.
Age may not be a state of mind, but the brain is definitely involved. That's the conclusion of a study published on Wednesday in the journal Nature, which provides compelling evidence that a specific structure in the brain, called the hypothalamus, plays a significant role in controlling the entire body's aging. The results suggest stem cells play a critical role, but only in part via their ability to generate new neurons.
The results come from researchers at the Bronx's Albert Einstein College of Medicine. They, along with several other labs, have generated evidence that suggests the hypothalamus plays a key role in aging. That makes a certain amount of sense: aging is a systemic process, and the hypothalamus contains structures like the pituitary that release hormones that influence the entire body. And there have already been some indications that factors that control the dynamics of aging end up circulating through the blood.
Aging and stem cells
But what controls the timing of aging? One intriguing possibility is that neural stem cells are involved. These stem cells continue to divide and produce new neurons even after the brain is fully developed, but their numbers appear to go down over time (possibly because more of them produce new neurons than are replaced by cell divisions). If the key factors are produced by neural stem cells, then their levels should go down over time, allowing aging to proceed.
Brain training may do little more than train healthy brains to be good at brain training, yet another study suggests.
In the new controlled, randomized trial involving 128 healthy young adults, researchers found that playing Lumosity brain-training games for 30-minute sessions, five times a week for 10 weeks resulted in participants getting better at playing the games. But researchers saw no changes in participants’ neural activity and no improvements in their cognitive performance beyond those seen in controls. The same went for participants who played video games not designed with cognitive benefits in mind.
The research, led by University of Pennsylvania psychologist Joseph Kable, is the latest ding to the billion-dollar industry that suggests its games can beef up mental abilities and ward off the cognitive declines of old age—among other things. Last year, Lumosity paid $2 million to the Federal Trade Commission to settle allegations that it baited customers with bogus claims that its games could cure and prevent mental declines and diseases, such as Alzheimer’s. No data suggest that the games can do that. And studies and analyses into the less grand claims of mental improvements have also been mixed: many found that benefits may only be seen in some users; those benefits may not extend beyond placebo effects, and they may not translate into real-world improvements in brain function.
Among the hundreds of scientific tests happening on the International Space Station, only one has yielded a result worthy of a B-movie starring Ice Cube. It turns out that flatworms undergo an odd and as-yet-unexplained transformation in space. When profoundly injured, they grow a second head.
Scientists who study tissue regeneration have long been fascinated by flatworms because of the worms' ability to regrow after being cut in half. The worms can even regrow heads. But as Tufts University biology researcher Junji Morokuma and his colleagues explain in a paper for the journal Regeneration, they have never seen a worm grow two heads after amputation. But that's just what happened when an amputated flatworm was sent to the ISS back in January 2015.
Эпической силы проект.
Подробности и процесс: https://www.artlebedev.ru/timestripe/
With genetically engineered color vision, gut-dwelling bacteria transform into vibrant artists—though their work is a bit derivative.
In a study published in Nature Chemical Biology, MIT researchers wired Escherichia coli with a synthetic network of 18 genes that allows them to sense and respond to red, green, and blue. Once excited by the colors, the genetic circuitry activates and inspires the bacteria to produce corresponding pigments or fluorescent proteins. Mats of microbes then turn their petri dishes into canvases, creating vivid replicas of patterns and artwork.
Right now, the bright bacteria simply demonstrate how far synthetic biologists have come in genetic tinkering. But, in the future, the researchers, led by MIT’s Christopher Voigt, hope that the RGB microbes could find a variety of applications. “Colored light offers many channels to pattern cells to build tissues or materials, control cells at a distance, or serve as a means of communication between electronic and biological systems,” Voigt and his colleagues write.
This month, teams from Japan and China have successfully extracted methane hydrate, a hydrocarbon gas trapped in a structure of water molecules, off the seafloor. The substance looks like ice but can be set on fire, and it’s energy-dense—one cubic meter of methane hydrate can contain 160 cubic meters of gas.
This makes searching for methane hydrate an attractive research project for several countries. According to the Department of Energy, methane hydrates are abundant on the seafloor and under permafrost, and they contain “perhaps more organic carbon that all the world’s oil, gas, and coal combined.”
Such vast reserves of fossil fuels are untapped because of how difficult it is to extract them. As a 2012 post from the Energy Information Agency (EIA) stated, until recently, methane hydrates “provided more problems than solutions.” Preventing their formation around deepwater oil and gas drilling operations has been a crucial part of planning ocean wells. The “ice” substance that contains the gas generally can’t just be picked up off the seafloor because it disintegrates outside of its high-pressure environment. The South China Morning Post wrote that current extraction efforts involve machinery “to depressurize or melt [the methane hydrate] on the sea bed and channel the gas to the surface.”