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Originally posted by Tuning Spork
First of all, the double slit experiment is done with photons, not electrons.
That being said, the final line of the presentation -- "The observer collapsed the wave function simply by observing" -- is incomplete. When the photons are in transit they are amounts of energy, not matter, and exist as waves of potential to do work. So long as they are not absorbed by the slit aparatus they'll continue on their way until they reach the wall.
The measuring device, or "observer", interacts with the photons and thus collapses the wave at the slit(s). In other words: in order to observe photons you must interact with them thus changing them.
The film states that the wave function collapses "simply by observing" it as if the experiment observed the photon in the same way as we might observe the dog across the street -- from a distance. The observation of the photons in the double slit experiment, however, involves manipulation, not simple "observation".