Archaeologists make a grisly find: Four hundred skeletons buried in a mass grave. The bodies have lain undisturbed for 500 years, since the time of the Spanish conquest. But this is no ordinary gravesite. The remains suggest these people met a gruesome end at the hands of the Aztecs, who ruled Mesoamerica in the 14th through 16th centuries. But who were the victims and why were they killed? Ángel de Cervantes will show a short film that traces the history of this historical event in the conquest of Mexico. He will also discuss which DNA markers are most identified with the victims of this massacre.