The Infamous Double Slit Experiment
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Comments: 1. It is not the observation that modifies the result, but the means of observation (electrons bombarding the sample when using electron microscope, photons when in plain sight viewing, etc.). Once you get down to particle scale it is next to impossible to make measurements without contaminating them. This is called Heisenberg's Uncertainty Principle.
2. The electron diffracts and goes through both slits because its De Broglie wavelength is similar to that of the gap between the two slits (due to its small mass).

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