I have had a lot of success with failure
The strength of the Constitution, lies in the will of the people to defend it.
To invent, you need a good imagination and a pile of junk.
Discontent is the first necessity of progress.
X-rays ... I am afraid of them. I stopped experimenting with them two years ago, when I came near to losing my eyesight and Dally, my assistant practically lost the use of both of his arms.
Whatever the mind of man creates, should be controlled by man's character.