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.

There's a world of insights to be gained into human health and disease by understanding how gravity and space radiation influence biology.

It's all very well setting up your own brand of face cream or exercise wear - but Christ, it's so shallow.

Any charity that aids or supports trying to find a cure for cancer is very close to my heart. My mom had cancer multiple times, so it's something that I can relate to.

For example, lead paint in old houses can be a greater threat to children's health than lead that may be under some industrial site where there are no children.