The electron is a theory we use; it is so useful in understanding the way nature works that we can almost call it real.
Richard P. FeynmanStrange! I don't understand how it is that we can write mathematical expressions and calculate what the thing is going to do without being able to picture it.
Richard P. FeynmanIt's amazing how many people even today use a computer to do something you can do with a pencil and paper in less time.
Richard P. Feynman