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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.

NPR's Daniel Estrin talks to Kim Wehle, constitutional law scholar at the University of Baltimore, and David Frum of The Atlantic, about whether the insurrection clause disqualifies Donald Trump.

The Eagles' 1976 compilation album, Their Greatest Hits 1971-1975, has surpassed Michael Jackson's Thriller for the title of best-selling album of all time.

David Plotz of the travel website Atlas Obscura tells us about two more of his favorite unlikely parts of the world: Herodium in the Israeli-occupied West Bank and a clown-themed motel in Nevada.

The horse-sized Timurlengia euotica provides a glimpse into a 20 million-year gap in fossil records, when tyrannosaurs evolved from "marginal hunters" to "apex predators."

Three finalists have made the cut to be considered as the next top cop in Chicago. The city is battling a high murder rate, distrust of its police and dissatisfaction with the way the mayor handles police shootings, particularly of black men.

Thrasher, 19, topped a field of 50 in the 10-meter air rifle competition on Saturday, winning the first of more than 300 medals that will be awarded at the Summer Olympics.

Acting Assistant Attorney General Mary McCord told staff this week she is leaving to pursue other opportunities. McCord has led the probe into Russian election meddling.

Washington's National Mall will regain a star attraction Friday, when the Smithsonian's National Museum of American History reopens after a two-year renovation. It took $85 million and a horde of curators, builders, architects and advisers to reframe space for the museum's 3 million historic objects.

Immigration and labor issues are top of mind for farmers in Arizona. Nearly three quarters of farm workers in the United states are immigrants.