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Cats act high when they're given catnip because, well, they are. Researchers say that catnip and another plant, silver vine, produce a chemical that activates their opioid reward systems.

NPR's Ari Shapiro talks with Michael Kang, a professor of constitutional law at Northwestern University, about how the impeachment trial of former President Donald Trump could work in the Senate.

Many students said they thought they heard Valentine's Day balloons popping. Instead, it was a gunman at a South Florida high school. Seventeen people were killed and a former student was arrested.

In Parkland, Florida, 17 people were killed and a suspect is in custody. And, Thursday appears to be the last day for senators to come up with an immigration deal before their next recess begins.

President Trump said he is "totally opposed to domestic violence of any kind," following scrutiny of the handling of Rob Porter, the aide who resigned after allegations he abused two ex-wives.

Paleoanthropologist Daniel Lieberman says the concept of "getting exercise" is relatively new. His new book, Exercised, examines why we run, lift and walk for a workout when our ancestors didn't.

In a move requested by abortion rights advocates, Biden is preparing to overturn the Mexico City Policy, which prohibits U.S. aid to groups that provide or refer for abortion in other countries.

NPR's Mara Liasson discusses the executive orders that President Biden will sign Thursday to boost coronavirus testing, vaccination and treatment.

Soprano saxophonist Jane Ira Bloom and bassist Mark Helias play together in a new remotely recorded digital album. These seasoned improvisers line up just right, despite the recording challenges.

Actors, including Orson Welles, impersonated newsmakers in "The March of Time" news series that debuted in the 1930s.