“The truth is we don’t know what we don’t know. We don’t even know the questions we need to ask in order to find out, but when we learn one tiny little thing, a dim light comes on in a dark hallway, and suddenly a new question appears. We spend decades, centuries, millennia, trying to answer that one question so that another dim light will come on. That’s science, but that’s also everything else, isn’t it? Try. Experiment. Ask a ton of questions.”