I find out what the world needs. Then I go ahead and try to invent it.

To invent, you need a good imagination and a pile of junk.

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

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

First be sure a thing is wanted or needed, then go ahead.

I make more mistakes than anyone else I know, and sooner or later, I patent most of them.