Put sand under a hydraulic press and repeatedly crush it with gravity—let’s see how hard the sand “c

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Who said this UP can't build bridges? !

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Do you know how glass marbles are made?

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Do you know how a water-powered paddle wheel is made? Congratulations—you’ve just invented the water

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Those industrial machines and ingenious tools that are pleasing to the eye

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[Science] Magnify the tip of the pen N times!

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