Gorham Cave, Gibraltar. Archaeologist Clyve Finlayson, an expert on Neanderthal sites, finds an incredible double mark (a sort of X with other marks that make it look like a hashtag #) in the rock at one of these sites. He calls another expert, Francesco d’Errico, from the University of Bordeaux. He finds him on vacation in his native Liguria. Francesco tells him that it’s impossible for him to travel because he’s on vacation. A week later, he’s there, staring at the hashtag. They conduct a detailed physical and chemical analysis, concluding that the graffiti dates back 40,000 years, indicating cognitive abilities comparable to those of humans and superior to what was believed for Neanderthals.
