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3 Coolest Ancient Air-Conditioning Devices

Modern air-conditioning has become an essential commodity in many places, guzzling more than its share of energy as it shifts heat around buildings. But while scientists sweat to find solutions to cool this burning energy issue, over 1000 years ago ancient cultures had discovered sustainable precursors to air-con. Here are three of the coolest indoor-cooling innovations from those environmentally savvy ancients.

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