So the laser test with the slits is as followed as far as I understand. When observed, electrons act as particles. When not observed, electrons act as waves. How can electrons know if your eyes are open or closed? Unless your eyes give off some wort of radiation that it can pick up on. Also when the electrons are not observed and go through the slits, than are observed on the other end. They instantly change, how can they go back and time and change? Because they instantly change at the point of the gun.