Forever Young (washingtonpost.com)

Does he think this will make him immortal?

"Depends on what you mean by immortal," he says, sitting at Silicon Valley's Original House of Pancakes in Los Altos, Calif., letting his ham and eggs get cold. "There is such a thing as proton decay."

Pause.

He's talking about the eventual collapse of subatomic particles in untold eons.

Okay, what about merely geological time? Hundreds of thousands of years?

"Oh yeah." He smiles. "That. For sure."