During deep sleep, waves of cerebrospinal fluid (blue) coincide with temporary decreases in blood flow (red). Less blood in the brain means more room for the fluid to carry away toxins, including those associated with Alzheimer's disease. Fultz et al. 2019 hide caption
Science
Common vampire bats (Desmodus rotundus), such as this group day-roosting in a cave in Mexico, can form cooperative, friendship-like social relationships. B.G. Thomson/Science Source hide caption
For These Vampires, A Shared Blood Meal Lets 'Friendship' Take Flight
Shannan Troncoso, co-owner of Brookland's Finest Bar & Kitchen in Washington, D.C., has turned her customers into fans of Brussels sprouts. Catie Dull/NPR hide caption
From Culinary Dud To Stud: How Dutch Plant Breeders Built Our Brussels Sprouts Boom
A "murder" scene could seem creepy, but what is going on inside these crows' minds may be most unsettling. Dragan Todorovic/Getty Images hide caption
Newly Discovered Beetle Named For Greta Thunberg: Nelloptodes Gretae
A flyer reminding customers about vaping-related deaths and illnesses, on display in a Seattle vape store. The Washington State Board of Health recently passed a four-month emergency ban on flavored vaping products. It applies to products that contain either THC or nicotine. Jovelle Tamayo/Bloomberg/Getty Images hide caption
Some States With Legal Weed Embrace Vaping Bans, Warn Of Black Market Risks
This year the Drug Enforcement Administration is accepting electronic vaping devices (provided any lithium ion batteries are removed) during its annual National Prescription Drug Take Back Day event. Lane Turner/The Boston Globe/Getty Images hide caption
At Chicago's McCormick Place, neuroscientists from around the world presented their work to colleagues. But some researchers were denied entry because of the Trump administration's travel ban. Rob Piercy/Allen Institute hide caption
U.S. Travel Ban Disrupts The World's Largest Brain Science Meeting
Climate change is here. These 6 tips can help you talk to kids about it
Google's processor, Sycamore, performed a truly random-number generation in 200 seconds. The achievement marks a major breakthrough in the decadeslong quest to use quantum mechanics to solve computational problems. Above, a Google sign at the company's campus in Mountain View, Calif. Jeff Chiu/AP hide caption
A firefighter participates in a controlled burn in a forest outside El Perelló in Catalonia, Spain, on Sept. 27. NPR followed a special unit into the woods in Spain to see how they burn for prevention. Aaron Labaree for NPR hide caption