The digital reconstruction of a charcoal mural discovered more than two decades ago in the ancient Maya city of Calakmul, Campeche, has revealed the earliest known evidence of calendrical writing in Calakmul, the National Institute of Anthropology and History (INAH) reported. Until this discovery, there was no evidence of early written communication in Calakmul, as most of its known inscriptions date from the Classic period (250-900 CE). (Goog…