 You know, I look at the progress of mankind and I've read a little bit about history and in just a few thousand years we've come from farming, to being able to manufacture food in a test tube practically, from being able to walk on the ground following an animal, to being able to launch a rocket into space that will take us to the moon and bring us back. So I just think it's a wonderful thing to be part of this process and to be adding to the store of knowledge. Now everything that we now face because of our success, now that we can inhabit every square inch of the earth, now of course we now produce new kinds of problems that have technical parts of their solutions. So if you discover that there's oil has been spilled someplace, well maybe there's a technical process to go get it back. If you say, well we need to think of a kind of fuel that is renewable, well there's technical content to that, let's work on that. So human beings have been on earth looking about like we look now for about 100,000 years. Probably there were people even before that, but they were different. But only in the last 25 years we're seeing this incredible rapid growth of our abilities and our growth of our population and so everything is still in front of us. The world is changing so quickly and scientists have enough a lot to do with which way it's going to be able to go.