Temperature. High temperatures in the Sahara present a threat to human life. With daily temperatures often higher than 40°C exposure to this kind of heat leads to death or illness.
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The Sahara Desert doesn't take prisoners. It's a place where temperatures can soar to over 130°F during the day and drop to below freezing at night, where scorpions, snakes and other creatures roam freely across the dunes, where dehydration and heatstroke are a constant threat to those who are unprepared.