Lego

Lego Knitting Machine

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Knitting machine constructed entirely from Legos. There's a video as well.

Link

Lego Robot Rubix Cube Solver

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JP Brown built a robot out of Legos that solves the Rubix cube. This one's been around a while, but still mighty cool.

Link

Lego Computer

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Andrew Carol built a difference machine from Legos. The Difference Machine was invented by Charles Babbage, and uses Newton's method of differences to evaluate a polynomial.

This lego version can compute 2nd or 3rd order polynomials to 3 or 4 digits.

Link

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