Mexico Sacrifice Blood Found

In this undated image released by Mexico’s National Institute of History and Anthropology, INAH, sharp obsidian knives found in Cantona, in the central Mexico state of Puebla, are displayed for photos. Researchers in Mexico announced Wednesday that they have found blood cells and fragments of muscle, tendon, skin and hair on 2,000-year-old stone knives, calling it the first conclusive evidence from a large number of stone implements pointing to their use in human sacrifice. (AP Photo/INAH/Yadira Martinez, HO)