Enrique Blair: That’s right. This is one of the things that is hard to understand about quantum mechanics. In the classical world that we deal with every day, we can just observe something and we don’t have to interact with it. So we can measure something’s position or its velocity without altering it. But in quantum mechanics, observation or measurement inherently includes interacting with that thing, that particle.
Again, you’ve got this photon that goes through both slits, but then you measure it and it actually ends up going through one—once you measure it.
Robert J. Marks: This reminds me again of Invisible Boy in Mystery Men. The photon goes through one of the two slits while you’re looking at it. Unless you look away. Then it goes through both slits.
Enrique Blair: Right. Very tricky, those photons.News, “Here’s why the quantum world is just so strange” at Mind Matters News
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