Turns out, the first Americans had a wild mix of DNA from Neanderthals and Denisovans—and it might’ve helped them survive new diseases in the Americas! Researchers found a Denisovan gene (MUC19) in about 1 in 3 Mexicans today, sandwiched between Neanderthal DNA. This genetic mashup could be why some populations were better equipped to handle new pathogens. Who knew our ancient hookups still impact us?! #History #DNA #AncientHumans