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Delta Air Lines will honor some incredibly inexpensive tickets it mistakenly sold on Thursday. Some cross-country trips were going for as little as $25. When it's obvious a seller has made a big mistake in your favor, is it OK to buy anyway?

This year, 15 bills in 11 states attempted to make undercover videos on farms illegal. Not a single one passed. Activists say a broad-based coalition that tapped the grass-roots concern for animal welfare helped defeat the measures.

The economy was still sluggish in 2013, but the housing and auto industries performed well. Guest host Celeste Headlee speaks with NPR reporter Sonari Glinton, and senior business editor Marilyn Geewax about those booming sectors.

Head injuries have long been considered a risk factor for Alzheimer's, but the evidence on that is mixed. A study finds that people who have memory problems decades after a concussion are more likely to have the brain plaques associated with Alzheimer's.

Amy Schumer talks a lot about sex — so much so that her Comedy Central special was called simply Mostly Sex Stuff. But her comedy is about much more than that. On her show Inside Amy Schumer, as well as in her stand-up, she tackles racism and awkward moments, and yes, sex, too. Also sex.

Last year, conservatives rallied around Chick-fil-A's president. Now, some are doing the same for Duck Dynasty star Phil Robertson, who was briefly suspended from his show for things he said about homosexuals. And they're planning a similar show of support.

The U.S. Fish and Wildlife Service is proposing to take the gray wolf off the endangered species list. The wolf had been extirpated from the West and had dwindled most other places in the U.S. The great canine has rebounded since it was reintroduced to the northern Rockies in the 1990s and is continuing to spread into the Pacific Northwest. But biologists warn that if these wolves loses federal protection, they will not be able to return to some places, such as Colorado, where the ecosystem sorely needs them.

Anyone who has waited endlessly at a red light at an empty four-way intersection knows traffic signals are not the most efficient way to keep traffic flowing. Computer scientists have figured out a way to utilize the space in intersections far more efficiently. The problem is the solution will have to wait for a day when cars can drive themselves.

This week's Must Read, our topical book recommendation series, usually focuses on events in the news. But today, with an eye on the dropping thermometer, book critic Parul Sehgal suggests a seasonal text. Kenneth Grahame's classic children's novel offers a cozy, eccentric depiction of winter — perfect for curling up with as the snow comes down.

As baby boomers retire and drilling increases, energy companies are hiring, adding 23 percent more workers between 2009 and 2012. But the hiring spree has come with a terrible price: Last year, 138 workers were killed on the job, twice as many as in 2009.