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Thousands of children swallow tiny batteries used in watches, calculators and toys each year. A team from MIT and Harvard is working on a pressure-sensitive insulating shield to prevent damage.

The planes used to spray Agent Orange in Vietnam weren't retired from service — they were used by reservists in the U.S. for more than a decade after the war, exposing the crews to harmful chemicals.

Airs Saturday, December 28, 2013 at 2 p.m. on KPBS TV

For some insects, sound waves or vibrations are the real social media — high-speed rumbles sent through the air and along leaf stems to help the bugs claim territory, send warnings and find mates.

Is America in decline, or an unparalleled leader on the world stage? In the 100th debate from Intelligence Squared U.S., two teams face off over the motion, "Declinists Be Damned: Bet On America."

On the whole, San Diego County's sophomores beat the state average when it comes to passing the high school exit exam, but an achievement gap persists.

A San Diego woman who paid $99 to have her genes analyzed by 23andMe wants her money back. And she thinks thousands of other customers will too. Just days after the FDA ordered 23andMe to stop selling its products, the company now faces a class action lawsuit.

Nepal is a poor country. Unemployment is high. Politics is a mess. But as one resident puts it, "[We] have the ability to be happy about how unhappy we are."

Researchers are trying to find ways to diagnose dementia earlier in Mexican-Americans so they can change their lifestyles or take medications sooner to delay the onset of diseases such as Alzheimer's.

Harold Agnew, a former Los Alamos National Laboratory Director who worked on the Manhattan Project, died Sunday in Solano Beach. He was 92.