Yesterday at work we used a dosimeter to measure the noise level of a machining process. When the employee reviewed the noise level she shared that a David put a finger in each side of his mouth and whistled over 100db. Very loud.
I was reminded of when I was a kid roaming the small Ohio neighborhood where I grew up. I could hear my Mom's whistle from blocks away. I don't ever remember dragging my feet when I heard that whistle. I do remember saying goodbye and running home. I never could whistle to the same effect.
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