By keeping my hand in that, it's the way I keep learning. The main way you learn in medicine is by practicing and working with patients.

To be clear, I worry as much about the impact of the Internet as anyone else. I worry about shortening attention spans, the physical cost of sedentary 'surfing' and the potential for coarsening discourse as millions of web pages compete for attention by appealing to our base instincts.

Gardening is not trivial. If you believe that it is, closely examine why you feel that way. You may discover that this attitude has been forced upon you by mass media and the crass culture it creates and maintains. The fact is, gardening is just the opposite - it is, or should be, a central, basic expression of human life.

In the world at large, people are rewarded or punished in ways that are often utterly random. In the garden, cause and effect, labor and reward, are re-coupled. Gardening makes sense in a senseless world. By extension, then, the more gardens in the world, the more justice, the more sense is created.

When you experiment with new forms of exercise, you stay motivated on a daily basis.

I was playing basketball at Lifetime Fitness every day for two hours. Like, I played an hour of basketball before I played David Ferrer in the semi-final.

Over 120 Aboriginal communities run their own health services - some have been doing so for 30 years. They struggle with difficult medical problems. They also try to deal with counselling, stolen generations issues, family relationships, violence, suicide prevention.

Incorporating genetics into a platform with the reach of ResearchKit will accelerate insights into illness and disease even further.