Jumping spiders actually fall asleep, even entering a REM-like state in which they may be dreaming. Learn more: scim.ag/3W9Vk0h

About 130 million years ago the first flowering plants emerged, eventually bearing a dazzling array of fruits that would grow alongside the dinosaurs. But researchers have long questioned whether dinosaurs ever made these earliest fruits a main course. Now, a toothless, turkey-size oddity with a parrotlike beak may be the first known dinosaur frugivore. Researchers report a newly discovered dinosaur that lived alongside Tyrannosaurus rex and Triceratops named Infernogallus jamesi—meaning “hell chicken”—that was fully adapted to a fruit-based diet. The anatomy bears a striking resemblance to modern parrots, the authors say. Learn more: scim.ag/3W7YW2R

On 20 October, the U.S. Food and Drug Administration approved the use of bepirovirsen to treat chronic hepatitis B infection, although the agency required monitoring of a liver enzyme and platelet levels to forestall side effects. Read more of our coverage: scim.ag/4v8vjdU

Four years ago, a dozen scientists packed into a control room at the European X-ray Free-Electron Laser (XFEL) Facility in Germany. A sliver of iron thinner than a human hair was squeezed to deep-Earth pressures between the tips of diamond anvils, then blasted to extreme temperatures by the x-ray laser. A surprising picture emerged on the consoles, says Sébastien Merkel, a geophysicist at the University of Lille who leads the $2.5 million project, called HotCores. The crystal structure of the iron was cubic—the first time the arrangement had been seen at such high pressures and temperatures. The result seemed impossible, Merkel says. “It’s really the last thing we expected,” he says. “It reopens a topic that I thought was closed.” For decades, experiments and computer simulations of Earth’s inner core, an alien world of solid iron some 5000 kilometers below the surface, suggested the iron atoms there form close-packed hexagons. But word of the new result has quietly roiled the small community of inner-core researchers. If the structure is instead what is commonly called body-centered cubic (BCC), it could change how heat is conducted, altering when in geological history the inner core began to solidify and how heat and elements were released into the molten outer core. Those processes affect how the outer core churns, powering the dynamo that generates Earth’s magnetic field. “If the structure is different, then the properties will be different,” says Shuai Zhang, a high-pressure researcher at the University of Rochester. The finding was difficult to publish. It finally appeared in August in the journal Physical Review B, after several high-profile journals turned it down, Merkel says. The delays may reflect resistance to reopening a question many researchers thought was settled. Yet to Jon Eggert, a materials physicist at Lawrence Livermore National Laboratory, “The data is very clear. I’m convinced they see BCC.” Learn more: scim.ag/4ihduok

With high-speed cameras and a “pitch cannon,” researchers are refining the automated ball-strike system about to call its first World Series. scim.ag/3UfezoC #LongReads

This "glue gun ant" fires sticky webs at its enemies. Learn more: scim.ag/4zL63Nk

The Rubin vase illusion demonstrates how some visual information escapes our awareness—a phenomenon researchers explored in monkey brains. scim.ag/4BoWCV8

Sometime between 250 and 400 C.E., a Maya woman was interred in Bats’ub Cave in mountainous southern Belize, accompanied by offerings associated with a journey to the underworld. But scattered around her pelvis and upper spine was something more mysterious: more than 226 human teeth. Now, DNA analysis has identified the teeth’s former owners: generations of elite families from the little-known center of Muklebal Tzul, whose other body parts were buried in tombs more than 26 kilometers away. These individuals were “buried in two places,” the research team that discovered them writes in a preprint, their teeth deposited in the cave in tribute to a powerful ancestor. Learn more: scim.ag/4yLZclQ

On #NationalPumpkinDay, learn more about how pumpkin, squash, and gourds would likely have gone the way of the dodo were it not for humans domesticating them. scim.ag/49hJAxd

Europe’s torrid summer set a gruesome record, killing more than 50,000 people in the continent’s cities from excess heat, according to research accepted for publication. The toll is nearly double the estimated deaths in European cities during two of the deadliest past heat waves, in 2003 and ’22. Approximately two-thirds of this summer’s deaths stem from global warming that exacerbated the sweltering conditions, the scientists concluded. The new study is a grim reminder that heat-related deaths continue to be a major problem in Europe despite growing awareness of what it takes to protect vulnerable people. Learn more: scim.ag/3WvfjXj

The National Institutes of Health (NIH) has spent the past decade compiling information on hundreds of U.S.-based scientists it believes tried to illegally help their country of origin, most often China. But it’s never been clear what triggered NIH’s aggressive pursuit of these scientists, many of whom eventually lost their jobs or even went to jail, and why it was so much more extensive than efforts at other federal agencies. Mystery solved. Science has learned that Tam Dao, an academic psychologist–turned–FBI special agent for counterintelligence, laid the groundwork for NIH’s campaign. Dao remains an important player in the debate over research security. Now head of campus safety and research security at Rice University, he will be tackling a question that arguably should have been asked before NIH plunged ahead: How often do foreign governments try to steal research at U.S. universities? Read more: scim.ag/4staPfR

There are glimmers of hope amid the relentless bad news about the explosive epidemic of the Ebola Bundibugyo virus in the Democratic Republic of the Congo. scim.ag/4siIecX

After a deadly blowout on the Deepwater Horizon rig in 2010 sent oil gushing, an emergency response team gambled on an unprecedented tactic. It sent robotic submersibles to the wellhead, 1500 meters below the surface, to inject chemical dispersants to break up the oil into tiny droplets and dissolve it. The hope was that by diluting the oil, the approach would minimize harm to wildlife. The move likely spared many seabirds, turtles, and shallow-water fish from oil that would otherwise have pooled at the surface. But it may have taken an unexpected toll in the deep sea. A 13-year survey, begun the year after the spill, has discovered a steep, sustained decline in fish, crustaceans, and cephalopods in the deep waters of the gulf. The most likely cause is the oil spill, researchers report in a new study, although they don’t directly blame the dispersants. Learn more: scim.ag/3W2yfMW

When you type an unpublished idea into a chatbot or coding agent, could it end up being used by the company that built the model—or a rival who asks the right question a year later? And what can you do to reduce the risk? No setting makes a chatbot fully private, but experts suggest steps that can make leaks much less likely: scim.ag/4sihqtz

Famed bat researcher Rodrigo Medellín Legorreta is pushing back against a government that views wildlife as a “nuisance.” Learn more: scim.ag/4zf5pHp #ScienceMagArchives

Like most insects, the wings of tobacco hawk moths are covered in tiny hairs. These microscopic strands help insects taste and stay stable in flight. But the tobacco hawk moth’s wing hairs do something researchers haven’t documented in any other insect: they help the animal smell. Learn more: scim.ag/4hKrfeZ

“They have found the original homeland of modern horses.” #ScienceMagArchives scim.ag/3VyPvJB

Beginning in the 1950s, malaria control programs sprayed a powerful insecticide known as dieldrin on the inside walls of homes, where Anopheles mosquitoes—the insects that spread the disease—often rested. Within a few years the bugs had developed a genetic mutation that made them impervious to the poison. Dieldrin was eventually abandoned as resistance spread and concerns mounted over its toxicity. But the story didn’t end there. Decades later, the mosquitoes have held onto one of the mutations that helped them survive the pesticide, despite the fact it makes them less active. Recent research may explain why: The mutation appears to make Anopheles mosquitoes more sensitive to sound, which may make it easier for them to home in on mates in noisy African cities, researchers report. What once helped the insects avoid death may now be helping them find mates. Learn more: scim.ag/4rU1u0f

Ninety-nine million years ago, this lizard tail parted ways from its owner—the first direct evidence of tail shedding in the fossil record. Learn more: scim.ag/4dKPR6e

Japan’s MMX mission aims to retrieve samples from Mars’s mysterious moon. They could reveal how it formed—and hold pieces of Mars itself. Learn more: scim.ag/4ybLS9Z