The human thermal regulatory system is remarkable. It allows humans to live under environmental temperatures that range from −45 °C in Arctic regions to + 50 °C in the Saharan desert, while maintaining the temperature of critical organs within ± 1 °C of 37 °C, without employing heating and cooling systems that we now take for granted. Of course, that requires building suitable shelters and wearing appropriate clothing, but it is still quite remarkable.

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