Educator and Make: author Gever Tulley helps kids build their own drill-powered go-karts at his Tinkering School in Montara, Calif., using small welded frames, bike parts, and cheap corded drills.
The Raspberry Pi can be the beating heart of a classic video arcade machine. And who doesn't want one of those? Pair it with an Arduino Esplora controller and play all your favorite arcade games from the 8-bit era.