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The drive to make more milk has had an unsavory side effect: Cows have become more genetically similar and less fertile. Scientists are trying to recover valuable genetic variation that was lost.

Philip Reeker, a U.S. diplomat overseeing European affairs, testified he had plans to defend former Ambassador to Ukraine Marie Yovanovitch, but Reeker was overruled by top State Department officials.

Julie Zetlin is the United States' top-ranked rhythmic gymnast; she has already qualified to compete in London. And while she wants a medal from the Summer Olympics, she also wants Americans to take her sport seriously.

President Trump's eldest son posted on Twitter Tuesday an email exchange that seems to show he entertained an offer of help from the Russian government during his father's campaign. NPR's Ari Shapiro talks with Jennifer Palmieri, who was a top aide for the Hillary Clinton campaign.

President Trump's legal team has been in flux for more than a week and several top name attorneys have turned down the chance to work for him. This come as Robert Mueller's special counsel team is intact and moving forward amid that chaos.

Bernie Sanders has made it clear he doesn't like closed presidential primaries. Making big changes to the system may be tough to do, though.

"Fire everybody at the top," one Democratic congressman says. Other advocates just want Biden to appoint new members to the Postal Service's board of governors.

A new WNBA season begins Friday without one of its biggest stars. Phoenix Mercury center Brittney Griner is still in custody in Russia following a drug smuggling allegation.

NPR's Ari Shapiro talks with Mark Cancian, a former Marine colonel and expert on military procurement, about Biden's request to Congress for billions of dollars to buy Javelin missiles to aid Ukraine.

Karajan shot to the top of the classical music scene in the 1950s, remaining supremely powerful until he died in 1989. He left a legacy of gorgeous recordings, as well as a fair amount of controversy.