the.com/waterwheel

Gravity's oldest employee, converting rivers into flour since before money existed.

means A wheel fitted with paddles or buckets that turns under the push or weight of flowing water, converting that motion into mechanical power.

from Straightforward compound of 'water' + 'wheel,' with the device itself far older than the English name — ancient Greek and Roman engineers (the term 'Norse mill' and 'noria' mark regional variants) built working versions over two millennia ago, using rivers to grind grain, saw wood, or lift water long before anyone needed a fancy word for it.

origin
used in ancient greece and rome, 4000 years ago
overshot vs undershot
water hitting top is way more efficient
legacy
directly inspired the industrial revolution's turbines
irony
replaced by electricity, which it helped generate
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