Keyhole saw

The Mind Surfer

In recent years, researchers have developed technology that allows people to control computers and wheelchairs with their brain waves. My Mind Surfer is a helmet that seems to allow its wearer to control a toy vehicle via brain waves, but the technology is based on something much simpler than brain waves. It has a Nintendo […]

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Marble Adding Machine

[youtube http://www.youtube.com/watch?v=GcDshWmhF4A?wmode=opaque&w=560&h=315] 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 […]

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