What is the origin of mind your P's and Q's? Various theories have been put forward. Some say that it was a warning to printers apprentices when sorting type, the letters p and q being almost identical in form, others that it was used in inns, the amount owing being chalked on a board in order that customers should not order more than they could pay for when settling day arrived.
(A recent snippet from my main blog)
(A recent snippet from my main blog)
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