This is the second of two episodes in which i sit down, virtually, with carlo rovelli to chat about his book, helgoland. In part one, we discuss the genesis of quantum physics and the strange consequences of a theory in which objects have properties of both particles and waves. So if you miss that, and quantum physics is new to you, i recommend going back before pressing play on to day's episode. For though still listening, were rejoining the conversation where we left off: no one still quite understands it.