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Since touching down in Jezero Crater, NASA's Perseverance rover has already cached 6 samples that could one day be brought back to Earth. Astrobiologists hope they hold signs of past microbial life.

Atmospheric scientist Ira Leifer installed special air sensors on a camper, then drove from Florida to California, measuring methane levels all along the way. More than 6,000 readings later, he found some noticeable spikes, especially around petrochemical plants and urban areas like Los Angeles.

The Centers for Disease Control and Prevention last week said that the coronavirus spreads "most commonly" through air — then took it back. Is this something I should be worried about?

With all the talk about domestic terrorism, you might assume there's a law against it. There's not. The storming of the Capitol has again raised the question about whether one is needed.

At 6'8", Donovan won Olympic gold medals as a player and coach, and a WNBA title coaching the Seattle Storm. She's being mourned by basketball greats from Tamika Catchings to Dawn Staley.

Congress is giving states $380 million to bolster the security of the 2018 elections. But getting that money out to local election officials has been a slow and laborious process.

A poll by NPR, the Robert Wood Johnson Foundation and the Harvard T.H. Chan School of Public Health finds opioid abuse a top issue for rural Americans.

David Letterman approached his final extra-long hour of late night TV on Wednesday with the same self-deprecation as the previous 6,000-plus, but leavened the snark with heaps of nostalgia and praise.

A Syrian forensic photographer, who goes by Caesar, took thousands of photos of those who have died in Syria's prisons. His photos will be on display in the halls of the U.S. Congress on Wednesday.

The lower premiums that come with bronze plans, plus Obamacare's caps on out-of-pocket spending, can make these plans the best deal for people who have very few medical expenses — or very many.