Science is simply a powerful way of understanding what's real and what isn't, what's true and what's not. It can help us determine what works, what doesn't, for whom, and under what circumstances.

Preventing cardiovascular disease can help free up critical resources for treating HIV/AIDS and other illnesses.

When the U.S. claims the right to invade any country unilaterally and then defines a country like Iran or North Korea as 'evil,' then it is a rational response for these countries to develop nuclear weapons as the only military deterrent to invasion. We create what we most fear.

Too much power in any institution tends to stifle innovation.

In the British Special Air Service, combat fitness is all about running.

I do it because I want to exercise people's compassion and I do it because I really believe that for some reason what I do is important and meaningful.

I try to work out regularly, but I'm not an exercise freak.

Fitness is about keeping yourself healthy. This is something you do for yourself and for your loved ones.