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Quantum weirdness - Double Slit Experiment
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This cartoon video isn't a bad popular description of wave–particle duality.

They make the observation bit seem more mysterious than it is. When you observe a particle (usually using some form of light) you can't but affect the thing you're observing slightly. It's called the uncertainty principle.

The clip came from the movie What the Bleep Do We Know!? which is widely criticised as pseudoscience. But this clip isn't too bad as long as you ignore the spooky observer bit, and it's a reasonable description of the results seen in the Double-slit experiment.

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12 years ago