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Wildlife photographer Gerrit Vyn and essayist Scott Weidensaul share bird calls and discuss some of the remarkable abilities of birds. Originally broadcast Oct. 20, 2015.

About 38,000 runners competed in the London Marathon today – and one of them ran it in orbit 200 miles above Earth. British astronaut Tim Peake says microgravity is "perfect" for post-race recovery.

Donna Edwards is vying to be just the second black woman ever elected to the Senate. But not all of the state's black female leaders or African-American members of Congress are lining up behind her.

The lawsuit, on behalf of three men, accuses two psychologists based in Spokane, Wash., of devising and overseeing an "experimental torture program" as a "joint criminal enterprise" with the CIA.

John Kasich and Ted Cruz will stay out of each other's way in three upcoming primary states. The nonaggression pact is an attempt to block Donald Trump from clinching the GOP nomination.

Puerto Rico is short of cash and at risk of defaulting on a $400 million debt payment due May 1. House speaker Paul Ryan pledged to have a plan ready by then to help Puerto Rico find a way to repay its more than $70 billion debt.

After Stanford scientist Lee Herzenberg gave birth to a son with Down syndrome, she and her husband worked to find a noninvasive test that would help mothers learn about the health of the fetus.

Intel is reducing its workforce by 12,000 people as it pivots away from chips for personal computers and toward other business lines. There will be cuts in California, Arizona and Washington too.

At least none of Trump's political opponents have been strapped down and had their heads shaved by him.

In a vote of confidence for citizen science, researchers who created an online RNA-folding game launched the project's first challenge aimed at a disease — creating a better tuberculosis test.