CNN: Like any good detective, Park Williams asks good questions. As a third-grader, for instance, the now-34-year-old's family took him on a road trip across the Rocky Mountains. He had to know: Why did the trees stop growing at a certain elevation? Why were there plants on one side of a mountain and desert on the other? In fifth grade, he heard a radio broadcast. A weatherman predicted that a drought in Northern California, where he grew up, would last for five more years. How did he know that? What...