During World War 1, Harry Houdini took 1 year off performing to help sell war bonds and teach american soldiers how to escape from German handcuffs.
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The Canadian province of New Brunswick (which was part of the UK at the time) had a bloodless war with the US state of Maine in 1839
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Napoleon constructed his battle plans in a sandbox.
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Ancient Romans at one time used human urine as an ingredient in their toothpaste.
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Clocks made before 1660 had only one hand - an hour hand.
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