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 ...
Officiating with a deep breath and a burst of air no longer seems wise in the coronavirus era. Is a hand-held, electronic whistle the answer? By Chantel Jennings More than 140 years after it made its ...
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