What is a Reuleaux triangle? Place a cup on the triangle and push it—something fascinating happens!

This is the only virus that humanity has completely eradicated: the smallpox virus—a highly contagio

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How to draw a circle?

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Yao Lao and Jin Yin Er Long, are you here to make fun of me?

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[Animals]What if a cockroach smokes a whole pack of cigarettes

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Yemen is the first country to be destroyed by drugs, even children are not spared. How tragic is it?

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The foreigner's giant plow tractor actually has a cab from the last century!

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You May Never Open This Video

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Painting - Paradox

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A leech vs 10 Periplaneta americana: A bloody battle!

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During the big fish dissection experiment, Senior Cat actually came along to taste it.

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"Earthquake Bed," which has been watched by 50 million people online, is about to release version 2.

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Why doesn't it hurt when a needle is stuck in my finger?

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Comparison of the size of tsunamis in history

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20 common mechanical transmission structures, I'm exhausted

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What kind of wisdom did the ancients have to design such a sophisticated mechanism?

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How to lay a qualified asphalt road? #Science #Unzip #Paving #Knowledge

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Gear latch process principle

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Tinker Bell's math learning CD clip

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The Great Wall version of the China Pavilion! The original Plants vs. Zombies with Chinese elements!

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