Can the Future Change the Past? Retrocausality — What Physics Really Says

Does the future reach back and touch the past? In 1945, Richard Feynman and John Wheeler proposed that every atom emitting light also sends waves backward in time. In 1986, John Cramer built that idea into the Transactional Interpretation of quantum mechanics — a handshake across time between emitter and absorber. And in real laboratories, experiments keep the question alive.