Backyard Zip Line
Be the hit of the neighborhood with a high-flying tree-to-tree zip line transporter.
Nails
Marble Adding Machine
Computers add binary numbers constantly, but we never see how. This elegant machine does the math using glass marbles. I started building marble track machines years ago using Lego. I experimented with all sorts of crazy ways for the marbles to descend. One was a rocker that shunted a stream of dropping marbles one-by-one to […]
5-Minute Foam Factory
Make this easy hot-wire foam cutter and reuse leftover EPS foam to create treasures from trash.
