The Aztecs are infamous for their blood thirsty cult of human sacrifice, but they were also one of the most technologically advanced societies of the ancient world. Dr. Elizabeth Baquedano has spent 25 years studying the Aztec Civilisation. It was the largest Empire to be seen in the new world – stretching from the Atlantic all the way to the Pacific. Baquendano knows the Aztecs to have an impressive understanding of modern medical science and explains how they used Obsidian to perform surgical operations.