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It's a mystery how butterflies manage to make their brilliant wing colors, but Yale physicists got a glimpse when they took the question to the lab, breeding dull brown butterflies into purple ones.

That means that one in seven people in the world access Facebook on a monthly basis.

It was a banner year for the acoustic guitar. NPR Music partner Folk Alley presents the best the genre had to offer.

Jason Isbell's Southeastern, Kanye West's Yeezus and an assortment of remarkable women dominated the Fresh Air critic's year in listening.

The nation used Twitter to mark the second inauguration of President Obama and to get information on the Boston Marathon bombing. But the year's most retweeted tweet was about the sudden death of a TV star.

The co-host for NPR Music's All Songs Considered shares the albums he returned to the most in 2013.

The host of All Songs Considered shares the albums he loved this year. Many of Bob Boilen's favorite albums of 2013 were danceable. Many were intimate. Some managed to be both at once.

Stanford University has set a new record for college fundraising: more than $1 billion in a single year. How did the school do it and what does it do with the money?

At two top-tier high schools in Palo Alto, Calif., the suicide rate is four times higher than the national average over the last 10 years. NPR's Audie Cornish speaks with Hanna Rosin, who's reported for The Atlantic, on what might be behind the trend and how the schools are responding.

Minnesota officials are rebuffing demands from U.S. Attorney General Pam Bondi, as the state continues its clash with the Trump administration over the surge of federal immigration enforcement.