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NPR's Ailsa Chang talks with Emily Kwong and Regina Barber of Short Wave about the fluid dynamics of crowds, an early fossil of a modern bird and new data on how people's moods change through the day.

Latinos, many from outside the U.S. mainland, have risen in prominence in horseracing, from the grooms to some of the winningest jockeys.

Elizabeth Miller and Brett Eagleson both lost their fathers on September 11, 2001. On the 24th anniversary of the day, they remain divided on how justice should be done.

From now until August, you can sign up for or change coverage through the federal and state health insurance marketplaces. Many people are eligible for better or less expensive plans — or both.

Deported under a little-known wartime law, more than 130 Venezuelans were sent from the U.S. to a maximum-security prison in El Salvador. Now released, several tell NPR they endured beatings, sexual abuse, and near-total isolation.

Chilean families are having only one child on average. U.S. birthrates are also dropping but it's unclear whether the U.S. will follow into the growing group of "very low" birthrate countries.

Jane Mayer writes in the New Yorker about Robert Mercer and his daughter, Rebekah, who have poured millions of dollars into Breitbart News, and who pushed to have Bannon run Trump's campaign.

Radio host Farajii Muhammad, writer Doyin Richards, and PR professional Jolene Ivey talk about Bill Clinton and Black Lives Matter protesters, a summit on gender stereotypes and a T-shirt controversy.

On the final night of the convention, President Obama will accept the nomination of his party.

This pre-election Political Junkie column focuses on all presidential swing states and key races for House and Senate.