 In his groundbreaking book, The Concept of Mind, Gilbert Ryle argued that knowing how to do something must be different from knowing any set of facts. No matter how many facts you might know about swimming, say, it doesn’t follow from your knowledge of these facts that you know how to swim. And, of course, you might know how to swim even without knowing very many facts about swimming. For Ryle, knowing how is fundamentally different from knowing that.