Concepcion Gimenez, physical anthropologist and academic responsible of the 'Osteoteca' (osteological collection), at the Anthropology National Museum (MNA), shows the skull of the 'Man of Tepexpan' approximately 6,000 years old, in Mexico City, March 9, 2018. The MNA houses one of the most important osteological collections in the world, with more than 25,000 skeletons, and more than 30 mummies. (Photo/Agencies)
