I think an interesting study in evolution is the study of machines and computers today. They are continually being mutated by man and the successful ones are reproduced. Look at airplanes. They have been mutated by man since 1907 and now we have airplanes that can fly for thousands of miles. It may seem a stretch, but we are natural just like other environmental varibles. And we have been acting on the airplane. Kind of a cool way to look at it.