Topic

heat

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Editorial illustration showing sunlight focused by a magnifying glass onto a tiny bright point on a leaf

LIGHT & HEAT

Why Does a Magnifying Glass Burn Things?

magnifying glasslenses

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Close-up of sweat droplets on skin during physical activity

Biology & Physiology

Why Do We Sweat?

Sweat cools you down through evaporation. But not all sweating is about heat. Stress sweat comes from different glands and serves an entirely different purpose.

sweatthermoregulation

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