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    Singularity Hub Daily

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    Latest Episodes:
    A Hybrid Coral Reef In Mexico Is Using Energy From Waves to Turn Sea Salt to Rock Sep 30, 2021
    Show notes

    Climate change is wreaking havoc on land via extreme weather events like wildfires, hurricanes, floods, and record-high temperatures. Glaciers are melting and sea levels are rising. And of course, the ocean isn’t immune to all this upheaval; our seas are suffering rising water temperatures, pollution from plastics and chemicals, overfishing, and more. A British startup is tackling one vitally important component of ocean damage: restoring coral reefs, and in the process, protecting the coastlines they sit on and fostering marine ecosystems within and around them. Ccell was founded in 2015 by Will Bateman, a civil and environmental engineer whose doctorate at Imperial College London involved studying the directional effects of extreme ocean waves. Bateman applied that research in founding the company, which uses an “ultra-light curved paddle” to harness energy from waves, combining this energy with an electrolytic technique to grow artificial reefs. Here’s how it works. A structure made of steel is immersed in the sea—a modular design with units 2.5 meters (8.2 feet) long and up to 2 meters (6.5 feet) high means the reefs can be customized for different areas—then low-voltage electrical currents produced by wave energy pass between the steel and a metal anode. This produces oxygen at the anode and causes the pH to rise at the cathode (the steel), causing the dissolved salts that naturally exist in seawater to calcify onto the steel and turn to rock. It’s a slow process—the rock grows at a rate of about 2.5 centimeters (1 inch) per year—but Ccell claims the method accelerates coral growth, enabling fragments of broken or farmed corals to grow faster than they would on natural reefs. The reefs are considered “hybrid” because they’re not fully natural, but once they’ve been in the water for a while, they essentially act as a substrate on which many components of a natural reef can thrive. Besides housing thriving ecosystems of marine life that include everything from coral to fish, lobsters, clams, and sea turtles, reefs also help protect the shorelines they’re near by breaking down waves. While large waves tend to be destructive, small waves can actually re-deposit sand on the beach and help preserve it. Because Ccell’s reefs are porous, they induce turbulence in waves and further reduce their force before they reach the shore. Beaches in areas that draw tourists are particularly interested in keeping their sand. Ccell installed its first reef substrate over the summer at Telchac Puerto, a resort near the city of Mérida on Mexico’s Yucatan peninsula. If the reef succeeds at protecting the shoreline and fostering a healthy marine ecosystem, Ccell will likely be installing many more like it in the near future. Artificial reefs aren’t a new idea. One similar to Ccell’s was installed in Sydney Harbor in 2019, and around the world are reefs made from decommissioned oil rigs, aircraft carriers, or ships. What sets Ccell apart is the electrolysis that helps rock form (which is based on a technology called Biorock that the Global Coral Reef Alliance has been using since 1996), and the fact that it’s now going commercial. It’s not just beach resorts that are taking note of hybrid reef technology. DARPA’s Reefense project is looking to hybrid reefs to “mitigate the coastal flooding, erosion, and storm damage that increasingly threaten civilian and Department of Defense infrastructure and personnel.” Crowdcube, a British investment crowdfunding platform that led Ccell’s seed funding, estimated a global market of £50 billion ($67 billion) for hybrid reefs, noting that Quintana Roo—the Mexican state adjacent to Yucatan, where Cancun and other popular resorts are located—spent around £7.7 million ($10.3 million) per mile to add sand to its beaches, and 6 to 8 percent of that washed away within a year. A more cost-effective, long-term solution is in order. Ccell appears to be on the right track, but at a rate of one inch of rock growth per y...


    China's Cracking Down on Kids' Screen Time, and the Implications Could Be Far-Reaching Sep 29, 2021
    Show notes

    Screens are taking over our lives. According to market research firm eMarketer, in 2020 adults in the US spent an average of 7 hours and 50 minutes per day looking at screens. That total is likely much higher for desk workers, who look at their computers during the work day then look at their phones or TVs in the evening. Screen time is bad enough for adults, but what about kids? Video games, social media, show streaming, and messaging have all become common activities not just for teens, but for children too, and the impacts often aren’t positive. Two weeks ago, for example, the Wall Street Journal broke the story that Facebook has downplayed findings from its own research on the ill effects of its platforms (namely Instagram) on teenage girls. Rates of depression, anxiety, and eating disorders among adolescents and adults are on the rise. In the US, it’s mostly up to parents to restrict or control their kids’ screen time and social media usage. But the degree to which parents try to limit these activities (and succeed at doing so) varies widely. In China, it’s a different story. Forget parents—the government has taken matters into its own hands and is seeing to it that kids don’t while away their time (and their young developing brains) on worthless screen-centered activities. Out of Time At the end of August, China’s National Press and Publication Administration implemented new rules restricting the amount of time that minors (defined here as under age 18) can spend playing video games, slashing the limit to one hour per day on weekends and holidays. The previous limit, set in 2019, was 3 hours on holidays and 1.5 hours on other days. Two weeks ago, ByteDance Ltd., which owns TikTok and its Chinese version Douyin, followed suit, implementing restrictions for users under 14. The app’s new “youth mode” allows kids and teens to be on the platform for up to 40 minutes a day total, and only between the hours of 6am and 10pm. “Adolescents are the future of the motherland, and protecting the physical and mental health of minors is related to the vital interests of masses, and in cultivating newcomers in the era of national rejuvenation,” the Press and Publications Administration said in a statement. In other words, the youth are the future, and if we let screens and social media turn their brains to mush while they’re young, the future’s not going to be very bright. Screen Time and Geopolitics? The restrictions come amid growing geopolitical tensions between China and the US, and crackdowns by the Chinese government over various sectors of the economy, from big tech to education to ride-hailing and real estate. Limiting kids’ screen time may not appear to be connected to China’s geopolitical ambitions, but considering the longer-term implications of these policies says otherwise. All else being equal, which country is more likely to produce a generation of great leaders, innovators, scientists, businesspeople, creatives, and the like: one where clear rules (and a cultural stigma) around screens force kids to spend time on more productive activities and curb the negative effects of screens on their mental health—or one where kids spend hours each day immersed in virtual worlds, distracting them from real-life activities and wearing down their self-esteem, focus, and social skills in the process? Of course, not all else is equal between China and the US. Though both nations are global powerhouses, they’re worlds apart in terms of culture, government, education systems, and social norms, to name just a few. It’s not unreasonable to think that government restrictions on kids’ screen time could help make China’s next generation more capable than America’s. But for one, it’s uncertain how strictly the time limits will be enforced. Douyin and gaming platforms will require name and age verification, and some gaming platforms will do periodic facial recognition checks on players. Tao Ran, who directs Beijing’s Adolescent Psychological D...


    Scientists Completed the First Human Genome 20 Years Ago. How Far Have We Come, and What's Next? Sep 28, 2021
    Show notes

    If the Human Genome Project (HGP) was an actual human, he or she would be a revolutionary whiz kid. A prodigy in the vein of Mozart. One who changed the biomedical universe forever as a teenager, but ultimately has much more to offer in the way of transforming mankind. It’s been 20 years since scientists published the first draft of the human genome. Since its launch in the 90s, the HGP fundamentally altered how we understand our genetic blueprint, our evolution, and the diagnosis and treatment of diseases. It spawned famous offspring, including gene therapy, mRNA vaccines, and CRISPR. It’s the parent to HGP-Write, a global consortium that seeks to rewrite life. Yet as genome sequencing costs and time continue to dive, the question remains: what have we actually learned from the HGP? After two decades, is it becoming obsolete, with a new generation of genomic data in the making? And with controversial uses such as designer babies, human-animal chimeras, organs-in-a-tube, and shaky genetic privacy, how is the legacy of the HGP guiding the future of humanity? In a special issue of Science, scientists across the globe took a deep dive into the lessons learned from the world’s first biomedical moonshot. “Although some hoped having the human genome in hand would let us sprint to medical miracles, the field is more an ongoing relay race of contributions from genomic studies,” wrote Science senior editor Laura Zahn. Decoding, reworking, and potentially one day augmenting the human genome is an ultramarathon, buoyed by potential medical miracles and fraught with possible abuses. “As genomic data and its uses continue to balloon, it will be critical to curb potential abuse and ensure that the legacy of the HGP contributes to the betterment of all human lives,” wrote Drs. Jennifer Rood and Aviv Regev at Genentech in a perspectives article for the issue. An Apollo Program to Decode Life Big data projects are a dime a dozen these days. A global effort to solve the brain? Yup. Scouring centenarians’ genes to find those that lead to longevity? Sure! Spitting in a tube to find out your ancestry and potential disease risks—the kits are on sale for the holidays! Genetically engineering anything—from yeast that brew insulin to an organism entirely new to Earth—been there, done that! These massive international collaborations and sci-fi stretch goals that we now take for granted owe their success to the HGP. It’s had a “profound effect on biomedical research,” said Rood and Regev. Flashback to the 1990s. Pulp Fiction played in theaters, Michael Jordan owned the NBA, and an international team decided to crack the base code of human life. The study arose from years of frustration that genetic mapping tools needed better resolution. Scientists could roughly track down a gene related to certain types of genetic disorders, like Huntington’s disease, which is due to a single gene mutation. But it soon became clear that most of our toughest medical foes, such as cancer, often have multiple genetic hiccups. With the tools that were available at the time, solving these disorders was similar to debugging thousands of lines of code through a fogged-up lens. Ultimately, the pioneers realized we needed an “infinitely dense” map of the genome to really begin decoding, said the authors. Meaning, we needed a whole picture of the human genome, at high resolution, and the tools to get it. Before the HGP, we were peeking at our genome through consumer binoculars. After it, we got the James Webb space telescope to look into our inner genetic universe. The result was a human “reference genome,” a mold that nearly all biomedical studies map onto, from synthetic biology to chasing disease-causing mutants to the creation of CRISPR. Massive global consortiums, including the 1000 Genomes Project, the Cancer Genome Atlas, the BRAIN Initiative, and the Human Cell Atlas have all followed in HGP’s steps. As a first big data approach to medicine, before the internet was ub...


    This Amazing GIF Shows a Million Neurons Firing in a Mouse's Brain Sep 27, 2021
    Show notes

    The brain is the center of every human being’s world, but many of its inner workings are yet mysterious. Slowly, scientists are pulling back the veil. Recently, for example, researchers have created increasingly intricate maps of the brain’s connections. These maps, called connectomes, detail every cell and synapse in small areas of the brain—but the maps are static. That is, we can’t watch the cellular circuits they trace in action as an animal encounters the world and information courses through its neural connections. Most of the methods scientists use to watch the brain in action offer either low resolution and wide coverage or high resolution and narrow coverage. A new technique, developed by researchers at The Rockefeller University and recently published in the journal Nature Methods, is the best of both worlds. Called light beads microscopy, the team was able to record hundreds of thousand of neurons in 3D volumes through time. In a striking example, they released a movie of a million neurons firing in a mouse brain as it went about its day. Typically, neuroscientists use a technique called two-photon microscopy to record neurons as they fire. Laser pulses are sent into the brain where they interact with fluorescent tags and cause them to light up. Scientist then interpret the light to infer activity. Two-photon microscopy can record small bands of neurons in action, but struggles for bigger groups. The light beads technique builds on two-photon microscopy, with a clever tweak. Instead of relying on single pulses too slow to record broad populations of neurons firing, it divides each pulse into 30 sub-pulses of varying strengths. A series of mirrors sends these sub-pulses into the brain at 30 different depths, recording the behavior of neurons at each depth almost simultaneously. The technique is so speedy that its only limitation is how quickly the fluorescent tags respond to the pulses of light. To test it, the team outfitted a microscopy platform—essentially a lightweight microscope that can be attached to a mouse’s head to record brain activity as it moves about—with the new light beads functionality and put it to work. They were able to capture hundreds of thousands of neurons signaling to each other from across the cortex. Even better? Because light beads builds on already-widely-used two-photon microscopy, labs should already have or be able to readily procure the needed equipment. “Understanding the nature of the brain’s densely interconnected network requires developing novel imaging techniques that can capture the activity of neurons across vastly separated brain regions at high speed and single-cell resolution,” Rockefeller’s Alipasha Vaziri said in a statement. “Light beads microscopy will allow us to investigate biological questions in a way that had not been possible before.” But the technique won’t replace standard two-photon microscopy, Vaziri says. Rather, he sees it as a complementary approach. Indeed, the growing quiver of imaging technologies, from those yielding static wiring diagrams to those recording function in vivo, will likely combine, quilt-like, to provide a far richer picture of how our brains do what they do. Researchers hope this kind of work can shed light on how the brain’s complex networks of neurons produce sensations, thoughts, and movement, what causes them to malfunction, and even to help us engineer our own intelligent systems in silicon. Image Credit: Alipasha Vaziri / The Rockefeller University


    This Google-Funded Project Is Tracking Global Carbon Emissions in Real Time Sep 24, 2021
    Show notes

    It’s crunch time on climate change. The IPCC’s latest report told the world just how bad it is, and.it’s bad. Companies, NGOs, and governments are scrambling for fixes, both short-term and long-term, from banning sale of combustion-engine vehicles to pouring money into hydrogen to building direct air capture plants. And one initiative, launched last week, is taking an “if you can name it, you can tame it” approach by creating an independent database that measures and tracks emissions all over the world. Climate TRACE, which stands for tracking real-time atmospheric carbon emissions, is a collaboration between nonprofits, tech companies, and universities, including CarbonPlan, Earthrise Alliance, Johns Hopkins Applied Physics Laboratory, former US Vice President Al Gore, and others. The organization started thanks to a grant from Google, which funded an effort to measure power plant emissions using satellites. A team of fellows from Google helped build algorithms to monitor the power plants (the Google.org Fellowship was created in 2019 to let Google employees do pro bono technical work for grant recipients). Climate TRACE uses data from satellites and other remote sensing technologies to “see” emissions. Artificial intelligence algorithms combine this data with verifiable emissions measurements to produce estimates of the total emissions coming from various sources. These sources are divided into ten sectors—like power, manufacturing, transportation, and agriculture—each with multiple subsectors (i.e., two subsectors of agriculture are rice cultivation and manure management). The total carbon emitted January 2015 to December 2020, by the project’s estimation, was 303.96 billion tons. The biggest offender? Electricity generation. It’s no wonder, then, that states, companies, and countries are rushing to make (occasionally unrealistic) carbon-neutral pledges, and that the renewable energy industry is booming. The founders of the initiative hope that, by increasing transparency, the database will increase accountability, thereby spurring action. Younger consumers care about climate change, and are likely to push companies and brands to do something about it. The BBC reported that in a recent survey led by the UK’s Bath University, almost 60 percent of respondents said they were “very worried” or “extremely worried” about climate change, while more than 45 percent said feelings about the climate affected their daily lives. The survey received responses from 10,000 people aged 16 to 25, finding that young people are the most concerned with climate change in the global south, while in the northern hemisphere those most worried are in Portugal, which has grappled with severe wildfires. Many of the survey respondents, independent of location, reportedly feel that “humanity is doomed.” Once this demographic reaches working age, they’ll be able to throw their weight around, and it seems likely they’ll do so in a way that puts the planet and its future at center stage. For all its sanctimoniousness, “naming and shaming” of emitters not doing their part may end up being both necessary and helpful. Until now, Climate TRACE’s website points out, emissions inventories have been largely self-reported (I mean, what’s even the point?), and they’ve used outdated information and opaque measurement methods. Besides being independent, which is huge in itself, TRACE is using 59 trillion bytes of data from more than 300 satellites, more than 11,100 sensors, and other sources of emissions information. “We’ve established a shared, open monitoring system capable of detecting essentially all forms of humanity’s greenhouse gas emissions,” said Gavin McCormick, executive director of coalition convening member WattTime. “This is a transformative step forward that puts timely information at the fingertips of all those who seek to drive significant emissions reductions on our path to net zero.” Given the scale of the project, the parties involved, and how ...


    A Ferocious Asteroid Strike Demolished an Ancient Middle Eastern City 3,600 Years Ago Sep 23, 2021
    Show notes

    As the inhabitants of an ancient Middle Eastern city now called Tall el-Hammam went about their daily business one day about 3,600 years ago, they had no idea an unseen icy space rock was speeding toward them at about 38,000 mph (61,000 kph). Flashing through the atmosphere, the rock exploded in a massive fireball about 2.5 miles (4 kilometers) above the ground. The blast was around 1,000 times more powerful than the Hiroshima atomic bomb. The shocked city dwellers who stared at it were blinded instantly. Air temperatures rapidly rose above 3,600 degrees Fahrenheit (2,000 degrees Celsius). Clothing and wood immediately burst into flames. Swords, spears, mudbricks, and pottery began to melt. Almost immediately, the entire city was on fire. Some seconds later, a massive shockwave smashed into the city. Moving at about 740 mph (1,200 kph), it was more powerful than the worst tornado ever recorded. The deadly winds ripped through the city, demolishing every building. They sheared off the top 40 feet (12 m) of the 4-story palace and blew the jumbled debris into the next valley. None of the 8,000 people or any animals within the city survived; their bodies were torn apart and their bones blasted into small fragments. About a minute later, 14 miles (22 km) to the west of Tall el-Hammam, winds from the blast hit the biblical city of Jericho. Jericho’s walls came tumbling down and the city burned to the ground. It all sounds like the climax of an edge-of-your-seat Hollywood disaster movie. How do we know that all of this actually happened near the Dead Sea in Jordan millennia ago? Getting answers required nearly 15 years of painstaking excavations by hundreds of people. It also involved detailed analyses of excavated material by more than two dozen scientists in 10 states in the US, as well as Canada and the Czech Republic. When our group finally published the evidence recently in the journal Scientific Reports, the 21 co-authors included archaeologists, geologists, geochemists, geomorphologists, mineralogists, paleobotanists, sedimentologists, cosmic-impact experts, and medical doctors. Here’s how we built up this picture of devastation in the past. Firestorm Throughout the City Years ago, when archaeologists looked out over excavations of the ruined city, they could see a dark, roughly 5-foot-thick (1.5 meter) jumbled layer of charcoal, ash, melted mudbricks, and melted pottery. It was obvious that an intense firestorm had destroyed this city long ago. This dark band came to be called the destruction layer. No one was exactly sure what had happened, but that layer wasn’t caused by a volcano, earthquake, or warfare. None of them are capable of melting metal, mudbricks, and pottery. To figure out what could, our group used the Online Impact Calculator to model scenarios that fit the evidence. Built by impact experts, this calculator allows researchers to estimate the many details of a cosmic impact event, based on known impact events and nuclear detonations. It appears that the culprit at Tall el-Hammam was a small asteroid similar to the one that knocked down 80 million trees in Tunguska, Russia in 1908. It would have been a much smaller version of the giant miles-wide rock that pushed the dinosaurs into extinction 65 million years ago. We had a likely culprit. Now we needed proof of what happened that day at Tall el-Hammam. Finding ‘Diamonds’ in the Dirt Our research revealed a remarkably broad array of evidence. The destruction layer also contains tiny diamonoids that, as the name indicates, are as hard as diamonds. Each one is smaller than a flu virus. It appears that wood and plants in the area were instantly turned into this diamond-like material by the fireball’s high pressures and temperatures. At the site, there are finely fractured sand grains called shocked quartz that only form at 725,000 pounds per square inch of pressure (5 gigapascals); imagine six 68-ton Abrams military tanks stacked on your thumb. Experiments with l...


    Alphabet's Project Taara Is Using Lasers to Beam Internet Across the World's Deepest River Sep 22, 2021
    Show notes

    A little over a year ago, Google’s Project Loon launched in Kenya, 35 giant balloons with solar-powered electronics inside beaming a 4G signal to the central and western parts of the country. The project was ambitious; each balloon, when fully extended, was the size of a tennis court, and the plan was for them to hover in the stratosphere (20 kilometers above Earth), forming a mesh network to provide internet service to people in remote areas. Just six months after its debut, though, the project was discontinued. Loon’s CEO at the time, Alastair Westgarth, wrote, “We talk a lot about connecting the next billion users, but the reality is Loon has been chasing the hardest problem of all in connectivity—the last billion users: The communities in areas too difficult or remote to reach.we haven’t found a way to get the costs low enough to build a long-term, sustainable business.” Westgarth went on to extol the learnings from the project, of which there were many. And now, some of them are going into a new initiative, called Project Taara, that wouldn’t have been feasible without the headway made by Loon. To send data between Loon balloons, engineers used optic communication, or as Baris Erkmen, Taara’s Director of Engineering calls it in an X blog post, wireless optical communications (WOC). A laser sent out from one site transmits an invisible beam of light to a data receiver on another site. When two sites successfully link up (“like a handshake,” Erkmen says), the data being transmitted through the light beam creates a high-bandwidth internet connection. It’s a complicated handshake. To give us an idea of the precision required in the laser and the difficulty of achieving that precision, Erkmen writes, “Imagine pointing a light beam the width of a chopstick accurately enough to hit a five-centimeter target that’s ten kilometers away; that’s how accurate the signal needs to be to be strong and reliable.” His team, he adds, has spent years refining the technology’s atmospheric sensing, mirror controls, and motion detection capabilities; Taara’s terminals can now automatically adjust to changes in the environment to maintain precise connections. Project Taara aims to bridge a connectivity gap between the Republic of the Congo’s Brazzaville and the Democratic Republic of Congo’s Kinshasa. The cities lie just 4.8 kilometers (2.9 miles) apart, but between them is the Congo River—it’s the deepest river in the world (220 meters/720 feet in parts! Pretty terrifying, if you ask me), the second-fastest, and the only one that crosses the equator twice. That makes for some complicated logistics, and as such, internet connectivity in Kinshasa (which is on the river’s south bank) very expensive. Local internet providers are putting down 400 kilometers of fiber connection around the river, but in a textbook example of leapfrogging technology, Project Taara used WOC to beam high-speed connectivity over the river instead. The connection served almost 700 terabytes of data in 20 days with 99.9 percent reliability. That amount of data is “the equivalent of watching a FIFA World Cup match in HD 270,000 times.” Not too shabby. WOC isn’t immune to disturbances like fog, birds, and even monkeys, as Erkmen details in the blog post. But his team has developed network planning tools that estimate the technology’s viability in different areas based on factors like weather, and will focus on places where it’s most likely to work well; in any case, having occasional spotty service is better than no service at all. According to the Alliance for Affordable Internet, almost half of the world’s population still lacks internet access, and a large percentage of those who have it have low-quality connections, making features like online learning, video streaming, and telehealth inaccessible. A 2019 report by the organization found that only 28 percent of the African population has internet access through a computer, while 34 percent have access through a mobile ...


    The Biggest Simulation of the Universe Yet Stretches Back to the Big Bang Sep 17, 2021
    Show notes

    Remember the philosophical argument our universe is a simulation? Well, a team of astrophysicists say they’ve created the biggest simulated universe yet. But you won’t find any virtual beings in it—or even planets or stars. The simulation is 9.6 billion light-years to a side, so its smallest structures are still enormous (the size of small galaxies). The model’s 2.1 trillion particles simulate the dark matter glue holding the universe together. Named Uchuu, or Japanese for “outer space,” the simulation covers some 13.8 billion years and will help scientists study how dark matter has driven cosmic evolution since the Big Bang. Dark matter is mysterious—we’ve yet to pin down its particles—and yet it’s also one of the most powerful natural phenomena known. Scientists believe it makes up 27 percent of the universe. Ordinary matter—stars, planets, you, me—comprise less than 5 percent. Cosmic halos of dark matter resist the dark energy pulling the universe apart, and they drive the evolution of large-scale structures, from the smallest galaxies to the biggest galaxy clusters. Of course, all this change takes an epic amount of time. It’s so slow that, to us, the universe appears as a still photograph. So scientists make simulations. But making a 3D video of almost the entire universe takes computer power. A lot of it. Uchuu commandeered all 40,200 processors in astronomy’s biggest supercomputer, ATERUI II, for a solid 48 hours a month over the course of a year. The results are gorgeous and useful. “Uchuu is like a time machine,” said Julia F. Ereza, a PhD student at IAA-CSIC. “We can go forward, backward, and stop in time. We can ‘zoom in’ on a single galaxy or ‘zoom out’ to visualize a whole cluster. We can see what is really happening at every instant and in every place of the Universe from its earliest days to the present.” Perhaps the coolest part is that the team compressed the whole thing down to a relatively manageable size of 100 terabytes and made it available to anyone. Obviously, most of us won’t have that kind of storage lying around, but many researchers likely will. This isn’t the first—and won’t be the last—mind-bogglingly big simulation. Rather, Uchuu is the latest member of a growing family tree dating back to 1970, when Princeton’s Jim Peebles simulated 300 “galaxy” particles on then-state-of-the-art computers. While earlier simulations sometimes failed to follow sensible evolutionary paths—spawning mutant galaxies or rogue black holes—with the advent of more computing power and better code, they’ve become good enough to support serious science. Some go big. Others go detailed. Increasingly, one needn’t preclude the other. Every few years, it seems, astronomers break new ground. In 2005, the biggest simulated universe was 10 billion particles; by 2011, it was 374 billion. More recently, the Illustris TNG project has unveiled impressively detailed (and yet still huge) simulations. Scientists hope that by setting up the universe’s early conditions and physical laws and then hitting play, their simulations will reproduce the basic features of the physical universe as we see it. This lends further weight to theories of cosmology and also helps explain or even make predictions about current and future observations. Astronomers expect Uchuu will help them interpret galaxy surveys from the Subaru Telescope in Hawaii and the European Space Agency’s Euclid space telescope, due for launch in 2022. Simulations in hand, scientists will refine the story of how all this came to be, and where it’s headed. (Learn more about the work in the team’s article published this month in the Monthly Notices of the Royal Astronomical Society.) Image Credit: A snapshot of the dark matter halo of the largest galaxy cluster formed in the Uchuu simulation. Tomoaki Ishiyama


    Drugs, Robots, and the Pursuit of Pleasure: Why Experts Are Worried About AIs Becoming Addicts Sep 17, 2021
    Show notes

    In 1953, a Harvard psychologist thought he discovered pleasure—accidentally—within the cranium of a rat. With an electrode inserted into a specific area of its brain, the rat was allowed to pulse the implant by pulling a lever. It kept returning for more: insatiably, incessantly, lever-pulling. In fact, the rat didn’t seem to want to do anything else. Seemingly, the reward center of the brain had been located. More than 60 years later, in 2016, a pair of artificial intelligence (AI) researchers were training an AI to play video games. The goal of one game, Coastrunner, was to complete a racetrack. But the AI player was rewarded for picking up collectable items along the track. When the program was run, they witnessed something strange. The AI found a way to skid in an unending circle, picking up an unlimited cycle of collectibles. It did this, incessantly, instead of completing the course. What links these seemingly unconnected events is something strangely akin to addiction in humans. Some AI researchers call the phenomenon “wireheading.” It is quickly becoming a hot topic among machine learning experts and those concerned with AI safety. One of us (Anders) has a background in computational neuroscience, and now works with groups such as the AI Objectives Institute, where we discuss how to avoid such problems with AI; the other (Thomas) studies history, and the various ways people have thought about both the future and the fate of civilization throughout the past. After striking up a conversation on the topic of wireheading, we both realized just how rich and interesting the history behind this topic is. It is an idea that is very of the moment, but its roots go surprisingly deep. We are currently working together to research just how deep the roots go: a story that we hope to tell fully in a forthcoming book. The topic connects everything from the riddle of personal motivation, to the pitfalls of increasingly addictive social media, to the conundrum of hedonism and whether a life of stupefied bliss may be preferable to one of meaningful hardship. It may well influence the future of civilization itself. Here, we outline an introduction to this fascinating but under-appreciated topic, exploring how people first started thinking about it. The Sorcerer’s Apprentice When people think about how AI might “go wrong,” most probably picture something along the lines of malevolent computers trying to cause harm. After all, we tend to anthropomorphize—think that nonhuman systems will behave in ways identical to humans. But when we look to concrete problems in present-day AI systems, we see other, stranger ways that things could go wrong with smarter machines. One growing issue with real-world AIs is the problem of wireheading. Imagine you want to train a robot to keep your kitchen clean. You want it to act adaptively, so that it doesn’t need supervision. So you decide to try to encode the goal of cleaning rather than dictate an exact—yet rigid and inflexible—set of step-by-step instructions. Your robot is different from you in that it has not inherited a set of motivations—such as acquiring fuel or avoiding danger—from many millions of years of natural selection. You must program it with the right motivations to get it to reliably accomplish the task. So, you encode it with a simple motivational rule: it receives reward from the amount of cleaning-fluid used. Seems foolproof enough. But you return to find the robot pouring fluid, wastefully, down the sink. Perhaps it is so bent on maximizing its fluid quota that it sets aside other concerns: such as its own, or your, safety. This is wireheading—though the same glitch is also called “reward hacking” or “specification gaming.” This has become an issue in machine learning, where a technique called reinforcement learning has lately become important. Reinforcement learning simulates autonomous agents and trains them to invent ways to accomplish tasks. It does so by penalizing them for fai...


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