Almost everyone has had the experience of falling badly because of something accidentally stuck in his or her hand. A glass, a camera, a book—anything at all. Without that something, one would fall much more gracefully, but one somehow cannot let go of it. One holds onto it as if one’s life depended on it. As I am laughing with a few friends about many such experiences, and each of us has had quite a few, a thought shapes in my mind: if this is such a deeply ingrained reflex, it must have very deep roots. And I immediately go beyond the human species: if you fall, you had better hold onto the branch that is in your grip already. We all laugh at this one, but I do not report my next thought: if I go for a theory with such tremendous ease whenever confronted with a puzzle, this reflex of mine must have very deep roots, too. Shall we go for prehistory once again?