The greatest invention in the world is the mind of a child.

The three things that are most essential to achievement are common sense, hard work and stick-to-it-iv-ness.

The chief function of the body is to carry the brain around.

I never view mistakes as failures. They are simply opportunities to find out what doesn't work.

The injurious agent in cigarettes comes principally from the burning paper wrapper. The substance thereby formed is called "acrolein." It has a violent action on the nerve centers, producing degeneration of the cells of the brain, which is quite rapid among boys. Unlike most narcotics, this degeneration is permanent and uncontrollable. I employ no person who smokes cigarettes.

We will make electricity so cheap that only the rich will burn candles.

I've realized that most of my best ideas have followed a good night's sleep.