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The mathematics problem he solved had been lingering since 1637 — and he first read about it when he was just 10 years old, during a visit to the library.

Although the de factor GOP presidential nominee had seemed open to the idea when asked by TV host Jimmy Kimmel, "it seems inappropriate that I would debate the second-place finisher," he says now.

Rodrigo Duterte, known for shocking language and linked to extrajudicial killings, has vowed to crack down on crime and corruption. His win isn't yet official, but his closest rivals have conceded.

Bronze plans provide the least generous coverage of the four tiers on insurance marketplaces, paying 60 percent of benefits, on average, compared with 70 percent for the more popular silver plans.

When we talk about foreign fighters joining ISIS much of the focus is on Western Europe, but proportionally more come from the Balkans. NPR's Scott Simon talks with security analyst Adrian Schtuni.

"Mr. Trump remains committed to reaching out to the Hispanic Community in more genuine and productive ways as he continues to share his vision to Make America Great Again," the campaign said.

As he has responded to mass shootings, Obama has become more forceful on gun politics, especially after the massacre in Newtown, Conn. But he's also frustrated at the failure to pass stricter laws.

Conservationists want a large swath of ocean off of Cape Cod to be declared a national monument. Fishing groups oppose the plan, which would make Cashes Ledge and other fishing areas off limits.

The warm, wet summer months in Puerto Rico are the perfect breeding time for the mosquitoes that carry Zika virus. As the mosquitoes multiply there, so do the human cases of infection.

The people in charge of the Oscars have announced reforms to increase diversity in their organization and in the awards. NPR's Rachel Martin speaks to Neda Ulaby.