Today, most of us cannot imagine waking up at the desired hour without our alarm clocks and smartphones. Clearly, such devices add to the convenience of our lives. But how did people wake up when alarm clocks did not exist or were not affordable to ordinary people? How did people ensure that they were not late for work? The answer is with the aid of “knocker ups”. Knocker ups were human alarm clocks –they were employed by clients who needed
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