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His decision to no longer contest doping charges means his records should be "obliterated," the head of the World Anti-Doping Agency says.

The post office is stuck with hundreds of millions of stamps bearing the likeness of Homer Simpson. The service predicted the stamps would be twice as popular as Elvis Presley. One billion stamps were printed, and Bloomberg reports only 318 million have been sold.

Human breast milk has health benefits for infants, but many mothers can't nurse their babies. Donor milk banks in some hospitals are looking to improve infant health by distributing breast milk donated by other nursing mothers.

Thousands of U.S. troops who served in Iraq and Afghanistan have suffered traumatic brain injuries. Now the military is trying to determine how many soldiers suffer concussions in exercises like hand-to-hand combat training before they ever reach a war zone.

There's a debate going on about whether President Obama's deferred action program for undocumented workers will help boost the economy, or hurt it. Guest host Viviana Hurtado hears two opposing views from Muzaffar Chishti of the Migration Policy Institute, and Vanderbilt University law professor Carol Swain.

A gunman opened fire outside the Empire State Building on Friday, shooting and wounding several people. The Associated Press reported that the gunman had recently been fired, and that he shot a former colleague to death.

Earlier this month, it was President Obama getting a dig in about Mitt Romney having once put his dog in a crate on top of a car. Today it was Romney making a reference to the "birther" conspiracy.

Reporting in Science, researchers write that many of today's most widely spoken languages, like English, Spanish and Hindi, can be traced back to ancient tongues in present-day Turkey. Evolutionary biologist Quentin Atkinson talks about investigating language evolution using the same methods geneticists use to trace flu virus outbreaks.

Lance Armstrong's announcement that he would no longer fight doping allegations might seem a crushing blow to his foundation for cancer survivors. But Livestrong's CEO says that "for the organization, it's the right thing."

A jury decided Samsung violated many patents and awarded Apple more than $1 billion in damages.