stackyFACTSShoving anything through a long pipe via air pressure causes it to rub against the walls violently. If you scale this up to move people or heavy goods, the sheer friction heat threatens to cook the payload before it arrives.
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What gross reality fully explains why massive blasts of warm wind occasionally shoot out of city street subway grates?
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That reassuring hum of the engines gets awfully quiet right before landing because the pilots have basically turned them to idle. To drop from cruising…
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