Research suggests that genes that make a natural sunscreen jumped from algae to an ancestor of vertebrates hundreds of millions of years ago. Some animals kept the ability. Others didn't.
Zoo nutritionists these days have to do more than try to keep displayed animals happy and healthy. Sometimes the goal is to bring endangered wildlife back from the brink.
In a treaty between the two sides, the Holy See switches its diplomatic relations from the Palestine Liberation Organization to the State of Palestine. Israel said it was "disappointed."
The former NBC Nightly News anchor's comments came on Fresh Air. Williams, the man who succeeded him, is serving a six-month suspension for exaggerating his experiences in the Iraq War.
The Women on 20s campaign is petitioning President Obama to put the face of Harriet Tubman, the escaped slave who led others to freedom, on the $20 bill. She edged Eleanor Roosevelt in a close vote.
Long-time Philly resident Gerald Renfrow wants you to know that there's more to his block than what happened on May 13, 1985.
Philly native Gene Demby was four years old when city police dropped a bomb on a house of black activists in his hometown. Thirty years later, he's still trying to make sense of it all.
NPR Paris correspondent Eleanor Beardsley doesn't expect a ton of sympathy when she complains about unending holidays in France. But when you have a kid who's always off school, it's tough. Really.
The country has been the scene of mass protests over President Pierre Nkurunziza seeking a third term. It's unclear whether the coup has the support of the full military.
Emergency officials in Nepal say at least 76 people have died in Tuesday's earthquake, which hit as the small country is still coping with a prior quake that killed more than 8,000.
Some companies are refusing to pay employee hospital bills that they think are out of line. Instead, they pay what they think is reasonable. So far the gambit appears to be working.
Some members of Congress would like to allow immigrants brought to the U.S. illegally to serve in the armed forces. But some Republicans are threatening to hold up a key defense bill over it.
LaToya Ruby Frazier's photography tells the story of the black community living in the shadow of Andrew Carnegie's first steel mill through portraits of her grandmother, her mother and herself.
The jury will decide whether 21-year-old Dzhokhar Tsarnaev should be sentenced to death or life in prison. They are expected to begin deliberations today.
Officials from South Korea's intelligence agency say North Korean leader Kim Jong Un's latest high-level purge took place in front of hundreds of onlookers at a shooting range.
Angela Duckworth worries that when it comes to measuring students' resilience, education policy may be getting ahead of science.
The derailment, which happened just north of Philadelphia, left five people dead and dozens injured. Amtrak cancelled service between New York and Philadelphia.
A federal appeals court thew out the most serious charge, sabotage, against 85-year-old Sister Megan Rice. Her case gained attention after supporters said she was being held in unfair conditions.
It has been more than three weeks since Hillary Clinton has answered a question from the press. That hasn't stopped reporters from trying.
More than a century ago, Puerto Rico used to produce world-class coffee. Now farmers there are trying to rebuild the industry by focusing on growing higher-quality beans, which command higher prices.