I see what you mean. But I thought "ripples of one wave affected the other wave" was the accepted interpretation of the double slit experiment. In other words, the double slit experiments prove the wave-particle duality. I wasn't aware that the wave-particle duality was considered evidence in favor of MWI.
In Fabric of Reality, David Deutsch claims the double-split experiment is evidence of photons interfering with photons in other worlds.
From Costanza's original thread (entire text):
Meta: