Somewhere between the ages of eleven and fifteen, the average child begins to suffer from an atrophy, the paralysis of curiosity and the suspension of the power to observe. The trouble, I should judge, to lie with the schools.

Even though I am nearly deaf, I seem to be gifted with a kind of inner hearing which enables me to detect sounds and noises which the ordinary person does not hear.

Time is really the only capital that any human being has, and the only thing he can't afford to lose.

Anything that won't sell, I don't want to invent. Its sale is proof of utility, and utility is success.

I try not to invent things that people don't need.

I never once failed at making a light bulb. I just found out 99 ways not to make one.

Because I readily absorb ideas from every source - frequently starting where the last person left off - I never pick up an item without thinking of how I might improve it.