I'm always fascinated to discover the origins of expressions. Where did the expression, for example, mind your Ps and Qs come from? Some are obvious and based on common sense. How much thinking does it take to realize the meaning of "A stitch in time saves nine." Every seamstress knows that. And then there are those relating to the company we keep. "One bad apple can spoil the whole barrel." or "Birds of a feather flock together." My mom used those expressions warning about the importance of choosing friends wisely.
