Why is there a big ball on the roof? It works without oil or electricity. Do you know how it works?

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The slowest aircraft in the world, F1D, has a thin layer of material, but can fly in the sky for 40

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The slowest aircraft in the world, F1D, has a thin layer of material, but can fly in the sky for 40

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Why do honey collectors only harvest a small portion of the hive when harvesting honey at high altit

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Why do honey collectors only harvest a small portion of the hive when harvesting honey at high altit

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Why does steel need to be rolled repeatedly? #Science #Unzip #Rolling #Forging

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Why does steel need to be rolled repeatedly? #Science #Unzip #Rolling #Forging

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Why do two people need to swing the hammer when forging iron? #Science #Unzip #Ironmaking #Forging #

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Why do two people need to swing the hammer when forging iron? #Science #Unzip #Ironmaking #Forging #

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If you often watch videos, you don’t know how terrible the job of a porn appraiser is!

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If you often watch videos, you don’t know how terrible the job of a porn appraiser is!

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Are the videos we watched fake? Has wild sex education been fooling us all these years?

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Are the videos we watched fake? Has wild sex education been fooling us all these years?

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The incredible "curved and straight" model, the rotating and tilted red straight rod, an interesting

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The incredible "curved and straight" model, the rotating and tilted red straight rod, an interesting

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What is "pneumatic transmission"? It's launched like a cannonball! Do you know how it works?

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What is "pneumatic transmission"? It's launched like a cannonball! Do you know how it works?

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Why can silver cut ice in seconds? Put a silver bracelet on it and a magical phenomenon will happen.

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Why can silver cut ice in seconds? Put a silver bracelet on it and a magical phenomenon will happen.

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The incredible paint "polyurea" makes you "invulnerable" after being sprayed on it. Do you know the

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The incredible paint "polyurea" makes you "invulnerable" after being sprayed on it. Do you know the

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Incredible "water-soluble cloth"! Put it in water and interesting phenomena will happen

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Incredible "water-soluble cloth"! Put it in water and interesting phenomena will happen

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The incredible "Feng Shui Stone Ball" weighs 29 tons. Why can it float and rotate on the water?

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The incredible "Feng Shui Stone Ball" weighs 29 tons. Why can it float and rotate on the water?

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How dangerous is it really to reach the summit of Mount Everest? Why does Everest have two "heights"

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How dangerous is it really to reach the summit of Mount Everest? Why does Everest have two "heights"

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What is "cyanotype"? Using sunlight to take photos can last for centuries!

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What is "cyanotype"? Using sunlight to take photos can last for centuries!

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Why do mints always have a hole in the middle? It turns out it can save lives in critical moments

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Why do mints always have a hole in the middle? It turns out it can save lives in critical moments

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How white is the world's whitest paint? Do you know why you don't need to use air conditioning in th

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How white is the world's whitest paint? Do you know why you don't need to use air conditioning in th

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What is the "coin paradox"? It appeared on the US college entrance exam, and only 3 out of 300,000 p

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What is the "coin paradox"? It appeared on the US college entrance exam, and only 3 out of 300,000 p

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Scary! It was a false alarm.

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Scary! It was a false alarm.

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Why can an anchor stop a hundred-ton giant ship? How long is the anchor chain? An animated explanati

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Why can an anchor stop a hundred-ton giant ship? How long is the anchor chain? An animated explanati

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What is "cobalt"? The "hero" element in phone batteries—why is it nicknamed "demon"?

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What is "cobalt"? The "hero" element in phone batteries—why is it nicknamed "demon"?

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