What would be the effect of removing the iron branch in the bicycle tire and replacing it with a sho

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Professional performance test

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Build a rubber band machine gun out of corrugated paper and hold up to 120 rubber bands!

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How powerful can an air pressure machine gun with a firing rate of 1200 be made from a Coke bottle?

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Just how impenetrable is this armor made of 1500 coins?

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Cyber bike

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Isn't this a perpetual motion machine?

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real man, no umbrella

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Two-wheel-drive bike, hand-assembled!

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Half tire + half tire = one tire

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New Tmax ... CTTO

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creative deformation chair

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The handsome origami mechanical triangle dart that takes off! It is recommended that boys have one

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