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It's a difficult day for law enforcement officers after the killings of police in Dallas and Baton Rouge, La. For many officers, tensions are high and morale is low.

A big study suggests that radiologists vary widely in their assessment of density, a risk factor for breast cancer. And density is just one component of breast cancer risk, the researchers underscore.

It's part of a pilot program from Doctors Without Borders in a part of Mozambique where roughly 1 in 10 adults is infected with the virus.

NPR's Audie Cornish interviews NPR contributor and critic Chris Klimek about the Aliens sequel and the 30th anniversary of the film.

One muggy Thursday, 50,000 rowdy rock fans packed Chicago's Comiskey Park to see disc jockey Steve Dahl blow up a crate of disco records. That evening's stunt helped birth a new musical movement.

A 17-year-old Afghan was reportedly wielding a knife and an ax. He was shot dead by police.

Legal guns are a reality for police, especially in states with open-carry or concealed-carry laws. But there's no consistent guidance for either gun owners or police on how to react to such weapons.

NPR's Scott Detrow reports on the party's platform. Steve Inskeep talks to Rachel Hoff, the first openly gay Republican on the platform committee. NPR's Kirk Siegler reports on protest demonstrations.

Some plants will release their pollen only to bees that buzz in just the right way. It's a risky strategy — and it's critical to human agriculture, from tomatoes to blueberries.

National security was front and center, with speaker after speaker — including Sen. Joni Ernst and Rudy Giuliani — bashing Democrats' responses to ISIS, immigration and the 2012 Benghazi attacks.