The late comedian George Carlin used to tell the story of pigeons in New York, known (as pigeons are everywhere) for their soft cooing sound. "I'm sure that at one time," George recalled, "pigeons had a really nice call." Something wild-sounding and clear. "But a few years in the city, man" - and the call is reduced to a soft coo. "Poor pigeions," George lamented: "Their song is stuck in their throat."

He made everybody laugh with that. But think about how the work environment can do that...

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