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robin. on Twitter: "I've just been reading about this Physics puzzle from the '60s. Quite baffling at first, if you haven't seen it before! Why, when the tube is inverted, is there
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robin. on Twitter: "I've just been reading about this Physics puzzle from the '60s. Quite baffling at first, if you haven't seen it before! Why, when the tube is inverted, is there
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moral-turtle525: A beautiful hourglass, pouring fine crystallized sand, around musical notes, stars, moons, seagulls, fireflies, cobalt blue starry sky with half moon in the background
