Im going to be wildly reductive in explaining this, but are you talking about the double slit experiment where photons are shot through two slits and create five slits on the wall behind it?
That proves that light particles move in “waves”
As in if you where to set up a similar experiment using water and two slits it would create a similar distribution on the other side.
I think what you think you are referring to is that an electron can only be measured. Meaning, we can only know where it is by looking at it. If we had two possible outcomes of where it could be, theoretically it would be in both states at the same time until we measured it.
Which have lead some to conclude that if it is at both places theoretically at the same time then with every choice to measure it those two possible out comes must become true in different realities.
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