Deep in the Amazon rainforest there lives a tribe most people have never seen. They’re called the Massaco, and until very recently, not a single outsider had laid eyes on them.
DNA research reveals that humans, Neanderthals, and Denisovans interbred thousands of years ago—creating a complex “braided stream” of human evolution still visible in our genes today.
For years, archaeologists have wondered why sections of fingers are missing from prehistoric painted hand stencils in European caves. A new theory offers one disturbing explanation.