A Self-Propelled Snowboard Makes Going Uphill Just as Fun

When Archimedes thought up his revolutionary water-pumping screw, little did he know that one day a group of high school students in Lyon, France would find a better use for his design. Their Propul-Surf uses a pair of horizontally-mounted screws to push a snowboard through the snow when gravity doesn't provide… » 4/26/13 9:02am 4/26/13 9:02am