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

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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Cardboard track ball, rotating elevator successfully tested

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How did ancient door locks work?

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The Adventure of Rolling Balls in Life

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Wooden track ball, tested successfully

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

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

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Beauty is actually simplicity ~ the beauty of rubbing, let’s play together!

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Super comfortable and extremely stress-relieving

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Gear rings are like life, let the good life roll on

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This is a dazzling pigment that sparkles

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The Impossible Twelve Copper Pillars

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unexpected results

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How do you think it can be taken out?

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Topology in life (4)

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CCC cooling spray ~ multi-layered wax skin iceberg + refill⁹

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Lawn Restoration

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The 12-year-old monster book is so good~ tearing down the brand new

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[Restore] The production skills of horse-faced skirts in the Ming Dynasty, feel the beauty of the ea

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