Double slit experiment
I was wondering if anyone had any references either in a book or on a credible place on the internet that goes through the troubleshooting or method of how people came up with the idea that it was the observer that changed the results of the experiment.
Everything I read kind of just "says" it was the observer that made the wave into a particle pattern with no information on the methods used in the observation. How do they know the methods of observation didn't somehow change the results and not the "Observer" him or herself?