Robert Langer: I graduated in 1974, and I graduated in chemical engineering. So at that time there was this gas shortage, not unlike a few years ago, and what happened was that, just like a few years ago, the prices of gas kept going up, but it was even worse then. I live in Boston, and if you had a car, you actually had to wait in line at the gas station for about two hours to get your car filled up. But the consequence of that is that if you were a chemical engineer you got a lot of job offers. So pretty much every one of my classmates, they went to the oil industry, and so I thought that’s what I should do too. So I applied. You didn’t have to work that hard. I actually got 20 job offers. Four were actually from Exxon alone! And one of them made quite an impression on me. I remember going to Exxon in Baton Rouge, and they had some people who were a few years older than me talk to me about what they were doing, and they were saying, “Boy, if you could just increase the yield of this one petrochemical by .01 percent,” they said, “that would be fantastic.” They said, “That’s worth billions of dollars.” And I remember flying back to Boston that night thinking to myself that I really don’t want to do that. I just thought it was boring. So what did I want to do?