I sat in on a biology course. I took the laboratory component of it, freaking out the poor graduate student who has this business school professor sitting in on his course. But he was kind enough to take me back to his lab and introduce me to his own advisor, and Peter and Lucy Cherbas gave me a bench in their laboratory and taught me how to clone genes. So I moonlighted cloning genes in their lab for a couple of years, figuring that genetics was the most rigorous place to start, figuring I’d work my way back up to the brain. That’s how I became a biologist. I became a biologist very much through that suggestion of my brother’s, and through this lucky series of accidents, and stumbling upon people who were kind enough to take me, and then picking up biology on street corners — admittedly very good street corners — in Cambridge, Massachusetts. But largely, most of my biology education came while I was teaching as professor of managerial economics at Harvard Business School.