The media wants to know how fast our new President, Barack Obama, will age over the next four to eight years, what with the stress of the Presidency. Practically every TV news network has a five-minute feature story on how past presidents have aged showing their pictures "before and after," the grey hair, puffy eyes, jowls, and lots of wrinkles (particularly those worry lines) have set in. And now, scientists know what causes all this to happen to Presidents and other worry warts; it's all about their telomeres.