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The 101 Freeway slices right through the wilderness in and around Los Angeles, separating local mountain lion populations. To mate and avoid inbreeding, the animals must risk the dangerous crossing.

The Nobel laureate taught at Princeton University for 17 years. Now, her papers — some 180 linear feet of them — are returning to be housed in the school's library. Also: a roundup of new releases.

Stockholm has a grainy photo of what it says shows "foreign underwater activity" in an incident eerily similar to the grounding of a Soviet submarine in the same waters in 1981.

Suspect Darren Vann confessed to one murder, with which he has been charged, and subsequently led police to six other corpses in northwestern Indiana, authorities say.

More and more Americans are dying from heroin overdoses. We take a look at North Carolina, where 183 people died from the drug last year.

The comet Siding Spring came closer to Mars than any comet has come to a planet in recorded history.

Doctors need to look at the eyes to diagnose disease, but the machines they use are big and expensive. An iPhone or tablet may do as well, scientists say, bringing eye care to the underserved.

Our digital and social media producer Rachel Rohr is back from a month-long trip cross-country, talking with young Americans.

The agency says if 2014 continues to be this hot, it's on pace to be the hottest year on record.

Today, protesters and officials from Leung Chun-ying's administration finally met, but little was accomplished.