Thomas Edison was one of the most prolific American inventors, receiving 1,093 patents over his lifetime. As a child, he was deemed "addled" by his teacher but was highly inquisitive and experimented often. He built his first laboratory in his family's basement at age 10. Later in life, he developed hearing loss but saw it as beneficial for concentrating on his work. One of his early inventions, a voting machine, was rejected by Congress. He later learned the importance of developing inventions with clear markets. Edison passed away in 1931 at the age of 84, on the anniversary of inventing the incandescent light bulb.