Most of the fundamental ideas of science are essentially simple, and may, as a rule, be expressed in a language comprehensible to everyone.

—ALBERT EINSTEIN1

Even for the physicist the description in plain language will be a criterion of the degree of understanding that has been reached.

—WERNER HEISENBERG²

If you cannot—in the long run—tell everyone what you have been doing, your doing has been worthless.

—ERWIN SCHRÖDINGER³