This isn't really a quick fact, but check out the double slit experiment. I learned about it in a high level physics class, and then was reminded of it recently when I saw it on Through The Wormhole.
The most interesting part of it is the fact that when they shoot a single photon, it behaves as it if it is going through two slits at once (which would mean that it is at two places at the same time), but when they use a detector to "watch" and see if it goes through both slits, then it behaves differently. So the photon knows when it is being watched and behaves differently.
The most interesting part of it is the fact that when they shoot a single photon, it behaves as it if it is going through two slits at once (which would mean that it is at two places at the same time), but when they use a detector to "watch" and see if it goes through both slits, then it behaves differently. So the photon knows when it is being watched and behaves differently.
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