Your Week Ahead: The beating of a butterfly's wing in one part of the world can, in theory, create air currents that cause a hurricane on some other part of the Earth. Under the right circumstances, that is. This is a very famous assertion often quoted by great experts. But they haven't got a clue whether it's actually true. How are you supposed to test a hypothesis like that? We might say much the same about the links we begin to see between various events in your life. Don't be too quick to take responsibility for something that is not your fault.