To draw a map of the round earth on a flat surface, Cartographers use map projections. There are several ways it can be done, but every type of projection distorts reality in some way. Scientists use a Tissot's indicatrix to quantify distortions that are introduced when creating a map
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Thanks to the fact that Mesopotamia was between two major rivers, Tigris and Euphrates, it was possible for agriculture to become highly developed there because the soil was extremely fertile, which led to the rise of the civilizations there.
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The Nazis began experimenting with poison gas for the purpose of mass murder in late 1939 with the killing of patients with mental and physical disabilities in the Euthanasia Program.
