A friend of mine knew a wealthy man who had decided to live forever. That made him hard to be around, my friend told me, in an e-mail, because he was “always dropping to the floor to do ab crunches or ...

Peter Diamandis is five feet four and has pipestem legs, but his torso widens into broad shoulders, powerful biceps, and a craggy, Homeric head. The composite effect is of a genie emerging from a lamp ...