NPR's Ailsa Chang talks with Stan Meiburg, the former acting deputy administrator for the Environmental Protection Agency, about the train derailment that led to a toxic spill in East Palestine, Ohio.

The "Red Baron" artist Tyler James Hoare has died at 82. For decades, he placed whimsical sculptures of biplanes, submarines and pirate ships on pier posts in the San Francisco Bay.

When Dungeons & Dragons fans saw a leaked draft of proposed changes to the game's copyright license, the backlash against publisher Wizards of the Coast was so severe it reversed course.

NPR's Ari Shapiro talks with Mauricio Cantor, behavioral ecologist at Oregon State University, about his study on how humans and dolphins work together to fish in a southern Brazilian city.

The company behind Dungeons and Dragons is looking to change its copyright license. Leaked drafts showed a clamp-down on fan made content, and fans launched a campaign against it. So far, they've won.

Researchers have studied the physics behind heavy stones skipping across the surface of water. They say these findings could be applied to real-world problems like de-icing airplanes.

NPR's Ailsa Chang talks with Marcelo Rochabrun, Peru Bureau Chief at Bloomberg, about the ongoing protests against the Peruvian government which have left dozens of people dead.

NPR's Juana Summers talks with Geoff Freeman, president and CEO for the U.S. Travel Association, which advocates for the travel industry. He explains why air travel has been so disrupted lately.

Both Malcolm Alexander and Frederick Clay were exonerated after spending decades in prison. Clay has received financial compensation for his wrongful conviction, while Alexander still waits.

NPR's Mary Louise Kelly talks with Guilherme Casarões, political science professor in Brazil, about the parallels between Donald Trump and Jair Bolsonaro in the wake of riots in the Brazilian capital.

A new study suggests larger, curvy rocks can yield impressive throws when skipping stones on water.

NPR's Ari Shapiro talks with Malcolm Alexander and Frederick Clay, who spent decades in prison after wrongful convictions, about what it means to receive monetary compensation after exoneration.

It's a time of transition on Capitol Hill. As departing lawmakers pack up their things, first-time lawmakers like Maxwell Frost and Mike Lawler are getting ready to settle in.

NPR's Juana Summers talks with software engineer Daniel Patt about his website "From Numbers to Names," which uses artificial intelligence to find photos of victims and survivors of the Holocaust.

NPR's Juana Summers talks with political commentator Justice Malala about the fate of South Africa's president Cyril Ramaphosa.

NPR's Ari Shapiro talks with travel nurse Grover Nicodemus Street about the surge of three different infectious diseases ahead of the holidays.

NPR's Ari Shapiro talks with Andrew Weissmann, a former senior prosecutor on the Robert Mueller probe, about what's next for the special counsel on the Trump investigations.

Measurement officials have expanded the system of prefixes used to describe very large and small numbers, adding "ronna" and "quetta," among others, to the ranks of "giga" and "tera."

NPR's Juana Summers talks with Colorado State Representative Brianna Titone about the anti-LGBTQ actions and rhetoric she's seen in the state.

Researchers at the University of Tokyo found that rats react to the same tempos that humans like.