It’s the sound no one warns you about – but once you hear it, you never forget it. Known as the “death rattle,” the sound is a “biological lullaby” – a sign that within 23 hours, the body will fall ...

The Aztec skull whistle produces a shrill, screaming sound. A study shows that these whistles have a disturbing effect on the human brain. The Aztecs may have deliberately used this effect in ...

Archaeologists have discovered numerous ceramic or clay whistles at Aztec sites, dubbed “death whistles” because of their distinctive skull shapes. A new paper published in the journal Communications ...