Thanks to Sabine Hossenfelder for drawing to my attention the little video below, asking people (in Germany) what light is. As a physicist, she was disappointed that most people don't realise that their idea of light was wrong. But as a science communicator, I find it neither disappointing nor surprising. Let's unpick that. Is it surprising? Well no, not really. Although there might be passing mentions of photons at school, on the whole light is still solidly presented as a wave, certainly in the UK national curriculum. So I wouldn't at all be surprise by people saying it was waves. Equally I wouldn't be at all surprised by people saying particles thanks to popular science, or, for that matter, saying that they hadn't got a clue. As for disappointed, I really don't think we can be, because of the way scientists use words, something I'll come back to in a moment. I ought to clarify that arguably the best answer is that light is light. It isn't an...