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b 32. **How did William Addis invent the toothbrush?** William Addis invented the toothbrush by taking a small bone, making some small holes in it, and then putting some thin hard pieces of plastic in the holes. 33. **Was William Addis an ordinary person?** Yes, William Addis was an ordinary person. 34. **Only a clever person can invent new things.** b. False