Engraved human bones suggest ancient ritualistic cannibalism
Engravings on a human bone excavated from an early Stone Age cave site in the UK show human cannibals ate their prey and then performed ritualistic burials with the remains, said scientists from London's Natural History Museum. The 15,000-year-old forearm bone appears to have been chewed and then engraved with a zig-zag design before being broken to extract bone marrow.