Puzzles - if that's your thing

not really puzzles per se, but mathematical problems that have no real use, not for me anyway.

try this: http://www.fantasticcontraption.net/

a puzzle based on physics, no use in the real world other than it is more fun than your mathematical 'puzzles'. note that there is a solution to each of the puzzles that do not use any powered wheels, just gravity.
 
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