Scientists were fascinated by the ghostly find: a human skeleton buried in an Aztec temple with a clay, skull-shaped whistle in each bony hand. But no one blew into the whistles for nearly 15 years.

In the 1990s, archeologists in Mexico City unearthed a 500-year-old skeleton near an ancient Aztec temple—a victim of human sacrifice. A grisly discovery, yes, but perhaps even more chilling was what ...

Add Yahoo as a preferred source to see more of our stories on Google. During ritual ceremonies, the ancient Aztec civilization used a “death whistle” — a haunting instrument shaped like a human skull.