Overview: Nature is powerful and can snuff out life in an instant. But for three intrepid adventurers, nature holds mysteries just waiting to be discovered. When most others flee, Tim Samaras drives into the eye of the tornado. His technological innovations, and sheer nerve, give new insights on one of nature's most dangerous forces. For David A. Johnston, it's a race against time to study the science of volcanic eruptions. As Mount Saint Helens gets ready to blow, this young scientist puts his life on the line for science and prevents an even deadlier disaster. When George Mallory sets his sights on the world's highest peak, he knows he must forge his own path to be the first to summit Everest. What does it take for him to reach these unclimbable heights, and does he succeed? We examine the evidence almost a hundred years later.