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First, you must define "human." Some of the most basic things, like tool use and the control of fire, were discovered by hominids predating Homo sapiens. And how closely you define the term "event." "Tool use" had lots of steps-- some of the most important steps could probably be argued to be the invention of the spear, allowing you to kill from a distance for the first time (or at least, better than throwing a rock or stick, and not counting deliberate wildfires.) Also, "agriculture" needs to be in the list (lumping together all of the various crop domestication processes) and also animal domestication (lumping together all of those events.) And "money" as a portable token of exchange. Math. The germ theory of disease. Powered flight. The production, control, and manipulation of electricity...
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