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The Science of Keeping Cool
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NOVA: Making Stuff Colder
NOVA

NOVA 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 to stay cool... or they could visit South Dakota. (Watch Online)