Grand Master Zhou Grand Master Zhou has learned to harness the power of the mind and body and use it to perform exercises that push the limits. With the point of a sharp spear nested in the soft tissue of his throat, and the other on the bumper he will push a Volkswagon Beetle. Volcano Chasers When a volcano blows its top, people naturally run the other way. But not the O'Mearas. Meet the only living married couple on the planet who travel the world to chase erupting volcanoes, risking their lives and coming within 10 feet of the rushing molten lava to film it. Man's Best Friend This dog goes above and beyond the call of duty as ""man's best friend."" In fact this amazing pooch helps his disabled master by getting items off grocery shelves, picking up around the house and even using a cash machine. Sand Hogs More than 500 feet down, and far below the busy streets of New York, is a secret world inhabited by the Sandhogs--a brotherhood of 120 macho men who risk their lives