Vybarr Cregan-Reid writing for The Conversation, explains, "sweating is what really sets us apart …it is our ability to maintain an effective working temperature, not just so that we can keep moving, but so that we can keep thinking while in motion.”

Biological design says having two legs is better than having four, because it means less sun hits the body at the hottest part of the day, and standing tall in our vertical stance puts our brains further away from the harsher micro-climate at ground level.

Additionally, the evaporation of sweat is so effective that if a liter of sweat is able to evaporate on the skin, you lose about half a million calories of heat in the process.

The bottom line, Cregan-Reid says that as the mercury reaches the top of the thermometer, when the heat is on over the next  few days, think of those beads of sweat on your forehead, and the fact that the exposed skin there, and its ability to perspire, is what keeps your brain functioning in the heat.

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