This Ancient Technology Is Helping Millions Stay Cool

This summer, India has endured possibly its worst ever heatwave. The capital, Delhi, logged a record high of 52.9 degrees Celsius (127 degrees Fahrenheit) on May 29, while India’s northern states have baked at sustained temperatures of more than 42 degrees during the daytime. Only now, as the rainy season starts, are temperatures cooling. But in the coming years, things will only get worse.

For many, respite from the relentless heat has come from an improbable source: the earth. Special pots made from clay, when combined with water, can be used to chill drinking water and the surrounding

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