A new study that examines how kissing evolved suggests that ape ancestors and early humans like Neanderthals probably locked lips with their friends and sexual partners. The behavior may date back 21 million years. Humanity’s earliest kisses were recorded 4,500 years ago in Mesopotamia and Ancient Egypt, but Matilda Brindle, lead author of the research and an evolutionary biologist at Oxford’s Department of Biology, said kissing presents an “evolutionary conundrum.” It appears to carry high