Do you still believe your eyes?

Cardboard track ball, rotating elevator successfully tested

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200 wooden track balls and large wave boards in multiple colors were tested successfully

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Wooden track ball, tested successfully

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How did ancient door locks work?

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unexpected results

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The Adventure of Rolling Balls in Life

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Today, a fan sent me this steel, but I don't know what kind of steel it is. I can only try it out.

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How could a six-piece T-shaped puzzle fit in?

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Topology puzzles from childhood

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Do you know how to take out the Rubik's Cube from the bottle?

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Hand rub big screw

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Good for decompression~

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Topology in life (4)

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Daily chess puzzle 01

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Illusion Video

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How powerful is a load-bearing bridge built with a few small wooden bars?

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The Impossible Twelve Copper Pillars

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[Movie&TV] [Hot Kissing Scenes] Kissing on the Bed

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It's cool to watch

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[Film editing] Passionate kiss scene

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