Unsolved Mysteries of Nature (Unsolved Mystery Files)

How can massive stones slide across the desert untouched? Can lightning really bounce like a ball? Why was it raining fish in Europe in 2004? Nature holds some of our world's strangest mysteries. Some of the best minds on the planet have tried to explain these unsolved phenomena. With dramatic photos and intriguing theories, readers can go on an outdoor adventure to explore some of nature's most puzzling mysteries.