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From lemons to ham, salt is a handy food preservative. But researchers studying some really old salt crystals found them preserving something else — evidence of life.

Will the U.S. be able to salvage the remnants of the Summit of the Americas? And what does the growing boycott mean for U.S. influence in Latin America?

NPR's Sacha Pfeiffer talks with San Antonio Express-News reporter Jacob Beltran about the latest develops in the Uvalde, Texas, elementary school shooting.

NPR's Ailsa Chang speaks with Rebecca Salinas, a digital journalist at K-SAT TV, about the latest from the Uvalde school shooting in Texas.

Manufacturers intentionally make their products hard to fix. Right-to-repair advocate Gay Gordon-Byrne fights for laws to stop companies from monopolizing repairs and let people fix their own stuff.

Geothermal energy is a clean, renewable, nearly limitless energy source. Technologist Jamie Beard wants us to use more of it — and to do that, she's recruiting experts from the fossil fuel industry.

Materials scientist Andrew Dent takes us on a tour of the "materials library" where companies can find existing materials to reuse in their products—from chewing gum, to fish scales, to cow manure.

Each year, one cow can belch 220 pounds of the greenhouse gas methane. Animal scientist Ermias Kebreab experimented with alternative cow diets and found a surprising solution: seaweed.

According to his publicist, the actor died in his sleep in the Dominican Republic, where he was shooting a movie.

Nina Jankowicz was tapped to head the Biden administration's new Disinformation Governance Board but resigned after being deluged with online threats. Her new book is How to Be a Woman Online.