Learn how a cooling vest can help regulate body temperature in this video from NOVA: “Making Stuff Colder.” Host and technology columnist David Pogue explores what heat is and how it moves from areas of higher temperature to areas of lower temperature. Pogue first demonstrates how someone wearing military gear in hot conditions is susceptible to heat exhaustion, and then investigates the effectiveness of wearing a cooling vest as part of the gear. As Pogue exerts himself in a hot environment, his body temperature increases; however, when he puts on the cooling vest, the heat transfers to the chilled water in the vest, allowing him to stay cool.
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