Couple noob questions. 1.What is quantum mechanical definition of an observer? 2.Why is looking at the double slit experiment with your eyes while the electron goes through any different than a camera looking? Each one is looking, one can just see better. Is it the fact that the outcome can be known with the camera, but not with your eyes that collapses the wave function? So does the electron makes a distinction between resolution capabilities? I read some were that you have to accept the fact that qm is all about probabilities. So the electron leaves as a particle, becomes a probability wave and goes through the slits interfering with itself. Now is the probability wave actually manifesting? What ACTUALLY happens to the mass of the electron. Since matter cannot be created or destroyed, and if the particle doesn't actually manifest as a wave then were does the mass/energy from the electron go while its a "probability" while going through the slits.