I’m surprised at the number of YouTube and TikTok videos showing novel ways to pump water, but I guess it makes sense, because the whole world pretty much runs on water. If you haven’t seen these before, they often show someone sticking some pipes into water and shaking them back and forth until all of a sudden they start spouting endless quantities of liquid. It looks magical: There’s no apparent power source, but the water keeps flowing, sometimes from an outdoor body of water, sometimes from a container the person keeps refilling. It’s like these devices run on “free energy,” or energy with no apparent origin.
Could you actually make
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