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About the size of an office building, asteroid 2012 DA14 flew by Earth on Friday — coming within about 17,000 miles of the planet.

The A350 is Airbus' version of Boeing's Dreamliner, which was grounded because of fires started by the battery packs. The move makes the launch of the A350 less risky.

"We should think of doctors the same way we think of shirts," an economist says. "If we can get doctors at a lower cost from elsewhere in the world then we could save enormous amounts of money."

What would Isaac Newton be like if he had been born a few centuries later? A new play "Isaac's Eye" reimagines Newton and his scientific rival Robert Hooke. Playwright Lucas Hnath and actors Haskell King and Michael Louis Serafin-Wells join Ira Flatow to talk about the play.

In Chicago on Friday, President Obama explored his home city's gun violence problem at an appearance at a South Side high school — the same school NPR's David Schaper visited two years ago to report on its "safe passage" program to help students get to and from school safely. Schaper returns to see how the program and other anti-violence initiatives are working.

The fallout from Cold War bomb tests is shedding light on why the Achilles tendon heals so poorly after injuries.

Tracy Johnson lost her wife to war, but she didn't lose her family.

Pope Benedict's resignation kicks off a closely watched process to choose his successor. Some have put the odds on the next leader of the Roman Catholic Church coming from the Southern Hemisphere, and possibly from Africa, the fastest growing region for Catholicism in the world.

The baby dolls were born from racial segregation in New Orleans in 1912. A group of African-American prostitutes decided to express themselves through dance and costumes, challenging taboo by parading during Mardi Gras.

Weekend Edition Saturday host Scott Simon speaks with Sen. Dick Durbin about the prospects for gun control legislation. The Illinois Democrat chaired a Senate hearing on the issue of gun violence, but the congressional debate remains contentious.