In an unprecedented move, NASA is bringing an astronaut crew home early from the International Space Station because one astronaut has an undisclosed medical condition.

The fires affected millions of people in the region. It could take years to understand the health consequences, but ongoing research is helping to prepare people to weather the next fires more safely.

NPR's Juana Summers talks with Science correspondent Richard Stone about recent developments in the search for Leonardo da Vinci's DNA.

A new study analyzed the sleep patterns of jellyfish and sea anemones and found they share some sleep traits with humans. The research could provide insight into the origins and function of sleep.

The EPA won't consider the economic costs of harms to human health, at least for now. Legal and health experts are concerned that the change could make it easier for the agency to roll back rules.

Wildfires last January destroyed communities around Los Angeles. Homeowners say recovery has been slowed by fights with insurers to get their claims paid.

A federal judge ruled Monday that work on a major offshore wind farm can resume, handing the industry at least a temporary victory as President Trump seeks to shut it down.

Paleontologists Susannah Maidment and Chinzorig Tsogtbaatar share details about some of the cool dinosaurs discovered last year.

NPR's Short Wave talks about elephants' sniffing abilities, the remarkable migration of painted lady butterflies and a surprising discovery about the early universe.

NASA says a crew member on the International Space Station is unwell. The agency canceled a planned spacewalk for Thursday and is taking the rare step of ending the Crew-11 mission early.