But new evidence outlined in two papers published in the journal Nature challenges that hypothesis. Instead, the authors describe recently discovered remains that suggest the first Homo sapiens showed up more than 100,000 years earlier than we thought in a place many experts didn't suspect.

The fossils could represent the earliest known examples of H. sapiens ever found (if confirmed by further research), and they serve as evidence that members of our species lived beyond sub-Saharan Africa.

In 1961, a crew of miners was plowing into a dense wall of limestone in a hilly region west of Marrakesh when they struck a soft patch. The hardened beige surface gave way to a mound of cinnamon-colored dirt. Peeking out of the earth was a sliver of human skull.