Johannes Stark

At the head of these new discoveries and insights comes the establishment of the facts that electricity is composed of discrete particles of equal size, or quanta, and that light is an electromagnetic wave motion.

I do not think it possible for anyone to get by in life without prejudice. However, the attempt to do so leads many people to suppose that, in order to decide any moral question, they have to find an indubitable first principle from which they can deduce an answer.