If a brain is exercised properly, anyone can grow intelligence, at any age, and potentially by a lot. Or you can just let your brain idle - and watch it slowly, inexorably, go to seed like a sedentary body.

My brain power depends on my retained mastery of analyzing in detail what's happening in my world and in my mind and body. I must continue to practice to retain my constructive and analytic powers. The goal is to be a master of my environment.

Your brain - every brain - is a work in progress. It is 'plastic.' From the day we're born to the day we die, it continuously revises and remodels, improving or slowly declining, as a function of how we use it.

The essence of a government health care system - for people who have never lived under it and don't know - is waiting, waiting, waiting. You wait for everything. You wait for years for operations that are routine in America.

I watch a lot of football and you hardly ever see Premier League players go down with cramp. The fitness, the intensity of Premier League football is phenomenal.

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

I think health care is a mess. I think that, as a free market person, you can't even have that discussion unless you know what the service costs.