Yes! I just volunteered as a parent helper to a scientist in the school program. I was gritting my teeth as the "scientist" explained that light was "pure energ

Yes! I just volunteered as a parent helper to a scientist in the school program. I was gritting my teeth as the "scientist" explained that light was "pure energy". I think people use this to mean "insubstantial" and to contrast versus matter. But that still leaves the problem of light pressure. I.e. a flashlight is like a very very weak rocket engine.