Partial reprint from https://www.sciencealert.com/an-ancient-maya-civilisation-had-surprisingly-effective-water-filtration-system Several ancient civilisations, including the Greeks, Egyptians, and Romans, filtered their water. Sanskrit writings dating back to 2,000 BCE also mention water treatment methods. Now, archaeologists have discovered the Maya of Central America did too – and their water filtration system was incredibly effective. In a reservoir in what was once the major…