The thermal zones of the Earth according to the duration of hot, moderate and cold periods and to the impact of heat on the organic world

Everybody knows from his or her own experience that the body temperature remains constant with low ambient temperature; however, it may be less known that the body temperature also remains constant when ambient temperature exceeds the normal blood temperature. This fact makes it possible for humans to travel through and to inhabit red-hot regions where ambient temperature exceeds 38 C every noon, such as in the Colorado desert E1 and in parts of the deserts of the Old World, sufficient water supply provided.