The Visitors

“Over the past 10 years of excavations [in Mexico], scientists have recovered almost 2,000 stone tools and fragments. By analyzing the tools and the DNA in the sediment around them, the researchers were able to date them to between 25,000 and 30,000 years ago.

“The team found DNA from a range of plants and animals including black bears, rodents, bats, voles, and kangaroo rats. Interestingly though, no human DNA was found, suggesting that the owners of these tools didn’t stick around for long periods.” – New Atlas

or … weren’t human …