It's because somebody knows something about it that we can't talk about physics. It's the things that nobody knows anything about we can discuss.

Words can be meaningless. If they are used in such a way that no sharp conclusions can be drawn.

The first principle is that you must not fool yourself and you are the easiest person to fool.

Thus we can get the correct answer for the probability of partial reflection by imagining (falsely) that all reflection comes from only the front and back surfaces. In this intuitively easy analysis, the 'front surface' and 'back surface' arrows are mathematical constructions that give us the right answer, whereas .... a more accurate representation of what is really going on: partial reflection is the scattering of light by electrons inside the glass.

Religion is a culture of faith; science is a culture of doubt.

There is nothing that living things do that cannot be understood from the point of view that they are made of atoms acting according to the laws of physics.

I find that teaching and the students keep life going, and I would never accept any position in which somebody has invented a happy situation for me where I don't have to teach. Never.