Dr Lani Watson is fascinated by questions. She is a philosopher and honorary fellow at the University of Edinburgh, and formerly a research fellow at the University of Oxford.She has spent nearly two decades studying the art and science of questioning - working in schools and courtrooms, hospitals and press rooms, and in the heart of Silicon Valley. Across all her research, she has drawn one conclusion: questions are powerful. And if we learn to use them, we can harness their power for good.