When it gets too hot, humans sweat, when it gets too cold, they shiver. How does the body regulate its internal temperature at those mild climates where a person can wear anything from a few layers to nothing at all without feeling a major shift in comfort level?
Blood flow. Increasing flow to the extremities like your hands and feet will cool it down a little. Sending less to the limbs and more to the core will keep the internal temperature higher.
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