Should you leave your TV unplugged overnight? Not when there's an easier way to save electricity

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Mary Smith, a much-loved knocker upper in East London, specialised in shooting peas through a pipe to subtly wake up her clients (Credit: Alamy)Similar professions also sprang up in other European countries in the 19th Century. "In Italy, they had hooters," says Datta. "In France, they had reveilleurs." These were even less subtle than knocker uppers: they sounded shrill whistles to awaken their clients.

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