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For the latest in our "Ask an Expert" series, current NASA astronaut Donald Pettit and former astronaut Jeffrey Hoffman chat about their spaceflight experiences. From brushing your teeth to weightless dreams, the astronauts discuss the many curiosities of living in space.

On May Day, the Occupy Wall Street movement re-emerged to try to reestablish its message and place in the national conversation. Thousands marched in New York City, Oakland and other cities, then quickly faded from national view. Guests consider what sustains social movements, and why some fail.

The 9th U.S. Circuit Court of Appeals declared California's same-sex marriage ban, known as Proposition 8, unconstitutional on Tuesday. This paves the way for a U.S. Supreme Court case that could have far-reaching implications for gay marriage around the country.

In the U.S., what does it mean when a white family and a Black family share a last name — and one of their ancestors is a pioneer of Black history? How Black and white Woodsons became one family.

NPR correspondents and Sarah Mervosh of the Dallas Morning News talk about the latest from Dallas, U.S. law enforcement and politics, and Friday's news conference by the Dallas police chief and mayor.

Days after the marathon bombing, officials established the One Fund for Boston to assist victims and their families. Attorney Ken Feinberg, who managed similar funds after Sept. 11 and Virginia Tech and is managing this fund, says there's no easy way to decide who gets how much of the $30 million that's been donated.

NPR's wide-ranging interview with Virginia Sen. Tim Kaine covers Hillary Clinton's transparency, the nature of Donald Trump's support, Kaine's experience as a missionary in Honduras and his faith.

Tim Alberta is one of America's top political reporters. He's also the son of an evangelical preacher. In his new book, Alberta investigates how politics has corroded the Evangelical movement that raised him.

In a new interview, Questlove reveals why Drake vs. Kendrick was so triggering, how he regained his passion for hip-hop and what to expect from the new Roots album.

As President Trump addressed a joint session of Congress, reporters from across NPR's newsroom fact-checked his speech and offered context.