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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 noisemakers for nearly 15 years. When someone finally did, the shrill, windy screech made the spine tingle. If death had a sound, this was it. Roberto Velazquez believes the Aztecs played this mournful wail from the so-called Whistles of Death before they were sacrificed to the gods. The 66-year-old mechanical engineer has devoted h
