John Kleppe likes having the moon in his back yard. His astronaut is a small remote control vehicle equipped to explore the floor of Fallen Leaf Lake. In the four years he's been studying the lake, Kleppe said he has found trees that could challenge traditional thinking regarding global warming. "This is stuff no humans have seen," said Kleppe of the video images of the deep lake produced by the rover. "That to me is like having the moon in your back yard ... every time we go out, it seems we find another mystery." Kleppe, chairman of the...