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In a letter to the journal Nature published this week, astronomers Aaron Geller and Robert Mathieu offer an explanation for the origin of blue straggler stars in a star cluster called NGC 188. Geller suggests the stars fed on neighbor stars, leaving behind white dwarfs.

In a new book writer Debbie Nathan digs into archived material documenting the experiences of a patient known as "Sybil," who reportedly suffered from multiple personality disorder. Ira Flatow and guests discuss MPD, and its modern equivalent--dissociative identity disorder.

The Oakland minister who predicted the end of the world would take place on Friday, Oct. 21, was confronted by the continuation of the world instead. It marks the second time the ministry led by Harold Camping, 90, has settled on a doomsday date, only to have it tick by in quotidian fashion.

Perhaps more than any other Republican running for president this year, Michele Bachmann has railed against taxes. She says they're too high, and that the current tax code should be repealed. She also worked for the IRS office in St. Paul, Minn., for more than four years as a prosecutor. "The first rule of war," she says, "is know your enemy."

Even with the latest change to Cain's tax reform plan, the lowest-income Americans would see their tax bills rise because they'd face a trickle-down effect from business taxes and they would still face the 9 percent sales tax, analysts say.

Autofocus cameras hit the stores back in the 1970s, making it dramatically simpler for the average consumer to get a good shot. Later, the digital camera made it possible for just about anyone to process their own pictures at home on a computer. Now comes a camera that could represent another kind of photography revolution: the light field camera. Take the picture, but focus it afterward. Robert Siegel speaks with Lytro founder Ren Ng about the new light field camera that his company is producing.

Obama has always been opposed to the war in Iraq, and is fulfilling a campaign promise to bring the American involvement to an end. He says troop levels in Afghanistan will also be coming down.

Cain now holds a big lead over Mitt Romney in a new University of Iowa poll. Rick Perry and Michele Bachmann lag further behind, trailing even Newt Gingrich and Ron Paul.

Scott Simon talks to the champion boxers at the center of a new documentary about them — in addition to both being title-holders, they also happen to be brothers.

On the evening Oct. 16, 1859, abolitionist John Brown led a raid he hoped would ignite a nationwide uprising against slavery. Tony Horwitz tells the story of how Brown's defeat helped spark the Civil War, in Midnight Rising.