Interbreeding gets a bad rap these days, but early humans loved a bit of interspecies action. Genes from fossils show our ancestors had entanglements with both Neanderthals and an ancient group called Denisovans. But new research suggests they also got it on with another mystery relative, whose DNA still exists in people today. Scientists from Cornell University and Cold Spring Harbor Laboratory made the discovery by developing an algorithm that analyzes genomes. The software can identify segments of DNA that came from other species — even if it’s from an unknown source. The researchers applied the algorithm to genomes from two Neanderthals,…

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