Doctors tell us what’s wrong with our bodies today. Computer scientist Astro Teller says his BodyMedia devices and software will predict what is going wrong tomorrow.

Within a year, Teller expects them to have ten times their current store of data, enough, he says, to write programs that may predict when someone will suffer a cold, epileptic fit or heart attack. “If it’s true for just one case,” he says, “we’re on the cusp of a whole new wave of medical technology.”