Homo Habilis
2.8 to 1.5 million years ago the Homo Habilis evolved. This is one of the earliest members of the genus Homo.
Source: Carl Sagan, Cosmos (New York: Random House, 1980)
Image by Cicero Moraes under CC BY-SA 4.0 license
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Full disclosure, I may occasionally borrow a sentence from Will Durant's Story of Civilization. I absolutely love that collection!