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Grayl Geopress Water Purifier
The old rule of threes is still (roughly) accurate: three minutes without air, three days without water, three weeks without food. But! Some people are particularly freakish/motivated/genetically gifted, as in 22 minutes without air, 18 days without water and 74 days without food (thank you sciencealert.com). Human beings are generally pretty good at avoiding airless […]
