Everybody who's a physician, who makes vaccines, who wants to find the cure for cancer. Everybody who wants to do any medical good for humankind got the passion for that before he or she was 10.
To try to really land a spacecraft really on another world is really difficult, and if we lose that ability, it's going to be heartbreaking.
I really believe in science. It is a faith. It is a reverence akin to religion. But as we always say, it's different from religion in that, as near as we can tell, it exists outside of us. It has an objective quality, the process of science.
There is good evidence that Venus once had liquid water and a much thinner atmosphere, similar to Earth billions of years ago. But today the surface of Venus is dry as a bone, hot enough to melt lead, there are clouds of sulfuric acid that reach a hundred miles high and the air is so thick it's like being 900 meters deep in the ocean.