I recently heard about the "Transactional Interpretation", and comletely failed to understand it. I then looked it up on Wikipedia, and became even more confused. My main questions are: 1. I gathered that, after recieving a retarded wave, a detector will send out an advanced wave. What is classified as a detector? 2. How do the advanced and retarded waves interact? 3. How does this all give us a better idea of what happens during the double - slit experiment? I would be grateful for any helpful responces.