The human race evolved in Africa, where it was generally hot, and only gradually adapted to cooler climates. The transition was eased by the development of clothing and the taming of fire, but hairlessness does not naturally lend itself to the conditions in the Arctic — or in an Ice Age. This has been summarized in this comparison of temperature scales:
The human race evolved in Africa, where it was generally hot, and only gradually adapted to cooler climates. The transition was eased by the development of clothing and the taming of fire, but hairlessness does not naturally lend itself to the conditions in the Arctic — or in an Ice Age. This has been summarized in this comparison of temperature scales:
Fahrenheit: 0° = really cold outside • 100° = really hot outside
Celsius: 0° = fairly cold outside • 100° = dead
Kelvin: 0° = dead • 100° = dead