Apparently, the average "life span" of a vertebrate (chordate?) genus is 10 million years. Since the genus Homo is (perhaps) a bit under 3 million years old, that gives us 7 million years to go! Well, thank you. I think...
It might not be easy, though.
What´s the minimum number of people needed to survive an apocalypse?
What could drive humans to extinction?
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