What is a Halbach array? Changing the orientation of a magnet can enhance its magnetic properties. D

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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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Speed bump!! Amazing machinery~

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Super cool mechanical series of speed bumps!

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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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Super cool mechanical series of speed bumps! 7.18

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How to make a Rubik's Cube using paper

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Introduction to Traditional Group Farming Culture in Africa

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I advise you to quit porn (enlarging testicles)

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Comparison of the size of tsunamis in history

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