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Churchill asked his guest what he felt was the most important thing he had ever written. 'White Christmas,' was the reply. Churchill, perplexed, gave up and turned to someone else. It was only later that he was told that through a mix-up it was the composer Irving Berlin who had been invited to enjoy lunch and the wartime Prime Minister's company

A NAND gate (NOT-AND) is a logic gate which produces an output which is false only if all its inputs are true. It doesn’t sound too useful from a practical, logical sense. After all, how often are…