[Answer] What did Englishman William Addis invent in the 18th century while he was in prison?

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What did Englishman William Addis invent in the 18th century while he was in prison?

• Toothbrush:In the late 18th century, an Englishman named William Addis was imprisoned for inciting a riot. While in prison, he decided that the traditional method of cleaning teeth at the time – crushed shell or soot with a cloth – could be improved. He saved a bone from the meal he had eaten and carved it into a handle. He drilled small holes into the bone and inserted boar bristles, creating the basic form of the modern toothbrush. After he was released from prison, Addis modified and mass produced his invention, and made a fortune selling toothbrushes.

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