How to live longer

In a shocking challenge to conventional wisdom, Cambridge researcher Aubrey de Grey argues that the process of aging is merely a disease -- and a curable one at that. De Grey, a computer scientist and biogerontologist, believes humans could live for centuries, if only we approach the aging process as "an engineering problem." He outlines the seven basic ways people age, and how to "solve" each one. And if we get to work now, he says, humans alive today could live to be 1,000.