150,000 Years of Modern Humans. Most of It Is a Blank Page.

In roughly 300 years - from the scientific enlightenment through the Industrial Revolution to the present - human civilization has transformed beyond recognition. Randall uses that benchmark deliberately, because it reframes what becomes possible when you place it against the full human timeline. Paleoanthropologists have recovered skeletal remains that reconstruct as fully modern Homo sapiens - same cranial capacity, same upright posture, same physical architecture as contemporary humans - dating back at least 150,000 years. Tantalizing evidence pushes that figure toward 200,000.

The arithmetic Randall applies is simple and unsettling. At 25 years per generation, 200,000 years represents 7,000 generations of anatomically modern human beings - people with the same biological capacity for intelligence, innovation, and civilization that produced everything from the printing press to the space program in just a few hundred years. The question that framing forces is one Randall leaves deliberately open. If modern human beings have existed for 7,000 generations, and if 300 years of organized scientific effort was enough to produce the world we inhabit today, then the absence of any recognized advanced civilization in the preceding 199,700 years is not a neutral fact. It is a problem that demands an explanation.