How did Easter Islanders survive without wells or streams? | Ars Technica
https://arstechnica.com/science/2018/10/easter-islands-statue-builders-sort-of-drank-from-the-sea/
https://arstechnica.com/science/2018/10/easter-islands-statue-builders-sort-of-drank-from-the-sea/
But if people could catch the groundwater where it seeps out into the sea, they'd have fresh water—more or less. Water is safe to drink if it contains less than about 9,000mg of salt per liter; that threshold exists because we can't safely drink water saltier than our own bodily fluids, and blood plasma clocks in at 9,000mg/L. For comparison, sea water contains a whopping 35 grams of salt per liter, while anything less than 1,000mg/L is considered properly fresh. Everything in between is called brackish water, and it's apparently an acquired taste.
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