As a documentary filmmaker, I'm very respectful, and my interview style is not intrusive. I don't really have an agenda. I just go in there, I mumble something or other, I wait for them to speak, and I wait for them to stop.
I believe in eating smaller meals more often throughout the day to keep the metabolism going. Don't deprive yourself, just make better choices. At 50 years old it is definitely a lot harder to stay in shape then it was when I was in my 20's.
Scientists will eventually stop flailing around with solar power and focus their efforts on harnessing the only truly unlimited source of energy on the planet: stupidity. I predict that in the future, scientists will learn how to convert stupidity into clean fuel.