A question... Perhaps a dumb question... A simple question... or maybe not... In the experiment, why are the slits needed in the first place? If one shoots electrons, then the edges of the slit must therefore do something with them in order to make them act the way the do: the seem to interfere to each other. If the edges have nothing to with it, the shooting electrons without the slits should produce the same phenomena... The edges themselves contain electrons at their outermost "shell"... So... the dumb question is: what do the edges do ? In case of water waves, it is rather clear, what happens (hopefully) because of the edges... But no so clear to dumb old me... Haven't come to any good explanation in the textbooks... Why? Is it so obvious that a person with brains should be able to deduce that like 2+2 just by looking at it? Any ideas? P.S Thank you all kindly for the previous discussions at this forum!