What does "to observe" mean? I am pretty sure that you will recognise this video : about at 3:50, they claim that, when we observe an electron passing through a double slit, acts as a particle, as opposed to its wave property. Does that mean, if we place a 8 mega pixel digital camera in between the slit and the light source, will electrons behave as particles? I hardly think so. SO my question is, what is the context of observation in this video?