When the Aztecs dominated central Mexico, a blood-curdling sound like a human scream played through a small whistle. Luis Aceves via Unsplash In cultures around the world, instruments have brought ...

Professor Frühholz said: 'Since the Aztec skull whistle sounds close to a human scream ... In 1325 AD this sign, an eagle and serpent fighting on a cactus, was seen at Lake Texcoco - prompting ...