Since the 1960s, whitewater rafting has become a major leisure sport for major thrill seekers. It entails bumping down a swift moving river current, dodging boulders, and escaping other water hazards...

Water skiing was first performed in 1922 by Ralph Samuelson at 18 years of age. He and his brother would experiment daily until he came upon the discovery of leaning back with the ski tips facing up....