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Bull trout are dwindling in Montana as their home waters warm and invasive fish devour them. Scooping up threatened fish and moving them higher up the mountain could backfire. Is the risk worth it?

Many professors are postponing retirement, and colleges say it's hurting their efforts to cut costs.

The 2015 World Championship Punkin Chunkin event in Dover, Delaware, was canceled for the second straight year — organizers can't find insurance coverage.

Pluto's atmosphere has a blue haze, in a new photo from the New Horizons probe. But the particles causing that color are probably gray or red — and the planet's surface has red ice.

The bees that pollinate crops are on the brink of collapse. One big reason why: a virus-carrying mite. Now, researchers think a rare fungi could boost bees' immune system and attack the mite itself.

Critics say the U.S. is one of the few industrialized nations not to offer any paid leave for new parents, but now the Washington, D.C., Council is considering a bill that would grant workers in the nation's capital 16 weeks of paid leave — more than anywhere else in the U.S.

While people in Oregon are still mourning those lost in a shooting at Umpqua Community College, other school shootings in the United States continue to make headlines. Two separate incidents, one in Texas and another in Arizona occurred this week.

Experts say the field of forensic DNA is having a moment of truth about years of overstated claims, and it may tarnish its reputation as the "gold standard" of legal evidence.

NPR's Kelly McEvers speaks with DeRay McKesson of the group, "We The Protesters," about the meeting with presidential candidate Hillary Clinton in Washington, D.C., Friday.

In some areas where U.S. officials have given a green light, it hasn't been matched by their counterparts in Cuba. But here's a quick guide to where things stand right now.