NASA's Great Moonbuggy Race, April 13-14. Students engineer their own moonbuggies, then race on a simulated lunar-terrain course, including craters, rocks and lava ridges.
Calaveras Jumping Frog Jubilee, May 16. Inspired by Mark Twain's The Celebrated Jumping Frog of Calaveras County.
RoboCup 2007, July 1-10. The goal of the Robot Soccer World Cup, played at Georgia Tech, is to develop autonomous android soccer players who will be able to beat a human team by 2050.
The World Snail Racing Championships, July 21. Garden snails square off in this 25-year-old competition held in Britain. The world record: 13 in. in a blistering 2 min.