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30. What famous philanthropist was known as the "Nightingale of the House of Commons"?
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31. How many hours a day should we give to sleep?
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32. What is the most famous signal ever made to the British navy?
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33. What useful discovery was made by lighting a fire on the sand and using pieces of natron (sub-carbonate of soda) to support the cooking-pot?
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34. What are the "Borrowed Days" and how do they come by their name?