31. Bell’s innovation was initially criticized by which industry?
32. Bell’s legacy is celebrated on which annual day?
33. Which university did Bell teach at early in his career?
34. In which year was the telephone patented by Bell?
35. Bell developed a device to record sound waves using what?
36. What was the name of Alexander Graham Bell’s father?
37. Bell founded which famous research institute?
38. Bell was also a teacher for which group of people?
39. Bell’s wife, Mabel, was affected by what condition?
40. In which country did Bell pass away?
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