If Donald Trump was asked ""If oxygen was discovered in 1783, how could human breathe before"", this would probably be his answer. I have to say a lot of people have been asking this question. No, really. A lot of people come up to me, and they ask me. They say, 'How do people breathe before the discovery of oxygen'? And I tell them, look, we know what oxygen is. We've had almost eight years of the worst kind of chemistry you can imagine. Oh, my God, I can't believe it. Without the discovery of …