Two-wheel-drive bike, hand-assembled!

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【Handmade】Modified Super Speed Bike!

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How to make a lighter that works "forever"

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real man, no umbrella

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Lighten your toolbox! A real man's must-size adjustable wrench!

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Cyber bike

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Isn't this a perpetual motion machine?

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How powerful can it be to propel a car with carbon dioxide? Plus a crash simulation experiment!

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fun magnetic game

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