You've seen the Useless Machine here before, more than once. But what if you hooked two of them together? It's been done, but this is an extensive video clip from the folks who make the machines. No, you don't have to watch the whole eleven minutes if you don't want. There are technical difficulties at about 8:30 and 9:30, but they were worked out. No word on how long the batteries lasted. -via Boing Boing
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