As Russia's Ukraine war intensifies, some warn nuclear escalation is possible Russian President Vladimir Putin gave orders to his nation's nuclear forces over the weekend, but their exact meaning is unclear. Russia has more nuclear weapons than any other nation. Geoff Brumfiel
Magpies' unexpected reaction to GPS trackers may have revealed altruism in the birds Researchers tried to attach tracking devices to magpies for a study. But the magpies helped each other to remove them — a possible sign, the scientists say, of altruism in the birds. Christopher Intagliata
A rare fossil of a 170 million-year-old pterosaur with an 8-foot wingspan is found The National Museum of Scotland said the fossil of the pterosaur is the largest of its kind ever discovered from the Jurassic period. A Ph.D. student made the discovery while on a field trip. The Associated Press
AirTags are being used to track people and cars. Here's what is being done about it Apple's AirTags were billed as a easy way to track your keys and wallet, but now the small button-sized device are being used by stalkers and thieves to track people and steal cars. Michael Levitt
Matteo Cerri: Will humans one day hibernate? Bears and squirrels hibernate to survive harsh conditions; why not humans? If we want to travel deep into space or combat deadly diseases, physiologist Matteo Cerri says hibernation might be the key. Manoush Zomorodi
Dylan Selterman: What are our dreams — and nightmares — trying to tell us? We might forget our dreams mere minutes after waking. But psychologist Dylan Selterman says that if we pay attention to them, we could gain new information about our emotions, relationships and more. Manoush Zomorodi
Craig Richard: Whispers and haircuts — the science of ASMR Why do so many people experience brain tingles when watching ASMR videos? Physiologist Craig Richard shares the science behind the "Autonomous Sensory Meridian Response," and how it calms the mind. Manoush Zomorodi
New book explores advances in immune system science ‘We are having exponential growth in our understanding of the immune system. There’s just so much to learn, and our baseline has just been established.’ John O'Brien
Accusations of 'greenwashing' by big oil companies are well-founded, a new study finds Chevron, ExxonMobil, BP and Shell used terms like "climate" and "low-carbon" more frequently in recent annual reports, but their actions on clean energy didn't match their words, researchers conclude. Joe Hernandez
Confused about how worried to be about the pandemic? You're not alone It's another discombobulating moment in the pandemic, with lots of conflicting signs of where the virus is heading and what people should do about it on a day to day basis. Rob Stein
