I've been reading & watching videos about the double slit experiment, and I'm failing to see what's so interesting & strange about it (I hope someone can enlighten me on what I'm missing). The weirdness is NOT the fact that observing an electron changes it's behaviour (right?) At first I thought the strangeness was that simply observing a single electron could make it go through one slit instead of two (i.e. simply looking at a particle can change its behaviour - wow spooky!). But I recently learned, if I understand correctly, that there's nothing spooky about that at all - it's simply that in order to observe an electron you need to fire a photon at it, and the photon is energy which of course alters the electron in some way. Right? Simple and logical - not weird at all. Is the weirdness the fact that a single electron goes through both slits? The only other potential weirdness I can see is that single electrons fired one at a time at the two slits cause an interference pattern. This is a bit weird because the only explanation seems to be that each single electron somehow goes through 2 slits and interferes with itself. But is that actually weird? It doesn't seem any weirder to me than that fact that light sometimes acts like a particle and sometimes like a wave. If light can do it, why not an electron? Why is it so strange that a single electron acts like a wave and goes through both slits? It doesn't seem that weird and mysterious to me. I'm sure there probably IS something weird/mysterious/fascinating about the double slit experiment since everyone says there is and thinks it's a big deal, so if someone can help me to understand what that is I'd appreciate it.