"We don't like to see our friends, we like to have them."
Read about his inventions | Explore his philosophical side
"There's a great stigma to failure. But there's a greater stigma to not trying."
Read more about his failures | Understand the value of perseverance
"The only way to get the best out of life is to make the best of it."
Discover his sunny disposition
"I have not failed. I've simply learned how to make 6,000 light bulbs."
Learn about his inventions
"The only difference between a good man and a bad man is the way he makes his money."
Explore his views on economics
"I'm not an optimist. I'm a realist."
Learn about his realistic outlook