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SAN FRANCISCO -- Sixteen thousand years ago, woolly mammoths , Beringian lions and short-faced bears roamed a grassy steppe that stretched across North America into Alaska. [More]

As a first line of defense, steel barrels buried deep underground are designed to keep dangerous plutonium waste from seeping into the soil and surrounding bedrock, and, eventually, contaminating the groundwater. But after several thousand years, those barrels will naturally begin to disintegrate due to corrosion. A team of scientists at Argonne National Lab (ANL) in Argonne, Ill., has determined what may happen to this toxic waste once its container disappears.

The concept of reincarnation is some three thousand years old, but it's not simply a thing of the past. As Susan Spencer reports, the idea that we've lived before and that we'll live again is alive and well in American pop culture today.