NIH director Dr. Francis Collins on a life in science

For Dr. Francis Collins, the adventure of owning a Harley is nothing compared with the challenge of running the sprawling National Institutes of Health: "We have 27 institutes and centers," he told correspondent Rita Braver. 

"They range everything from institutes that are focused on a disease – the National Cancer Institute – to some that are focused on organ systems – the National Eye Institute, for Infectious disease, heart, lung and blood. And I've had a pretty good time getting the best people in the world to come and lead those institutes."

But now, after 12 years on the job – one of the longest runs in history – Collins will step down today.