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16 5 Putting on layers of clothing, building insulated shelters or simply lighting a fire are some simple yet effective ways of staying warm. Humans have shown they are quite adept at keeping themselves warm, even surviving through the last major ice age some 11,700 years ago. Eventually, the Earth started to warm up and humans found themselves nearly everywhere. When you think of the hottest places on Earth, you would picture a desert. The largest of the hot deserts is the Sahara with average temperatures reaching around 45°C or 113°F. The Sahara is so large it covers 10 countries, one of the most ancient being Egypt which has been around since 3000 BC. As seen below, there are depictions of servants wielding fans, though most likely only the nobility would have this luxury. Undoubtedly Egypt was warm and it would be