One of the hottest research areas in life sciences springs from the notion that each of our genes can make many different proteins--and that this fact, more so than our 30,000 genes, is what makes us so biologically complex. Now it turns out there's a new twist to this notion. Not only do genes make different proteins, they make them in varying amounts. Two people might have exactly the same gene, but one might make little protein and the other floods of it--a variation that just might account for the difference between, say, Al Roker and Connie Chung. But just how many genes express such variation from one person to the next, no one knew--until now.