"The final result of our researches has widened the class of substances sensitive to light vibrations, until we can pr…"

"There cannot be mental atrophy in any person who continues to observe, to remember what he observes, and to seek answ…"

"I had made up my mind to find that for which I was searching even if it required the remainder of my life. After innu…"

"Before anything else, preparation is the key to success."

"Neither the Army nor the Navy is of any protection, or very little protection, against aerial raids."

"The inventor...looks upon the world and is not contented with things as they are. He wants to improve whatever he see…"

"I begin my work at about nine or ten o'clock in the evening and continue until four or five in the morning. Night is …"

"Perseverance must have some practical end, or it does not avail the man possessing it. A person without a practical e…"

"I am a believer in unconscious cerebration. The brain is working all the time, though we do not know it. At night it …"

"Mr. Watson — Come here — I want to see you."