The reason why the observer effects the experiment is that the particle being detected has to interact with another particle so that the observer can actually know anything about it. For example (roughly); to "see" a proton you have to hit it with a photon. This interaction changes the behaviour of the proton. You cannot see the proton, or other subatomic particles, without first changing it.
This is related to Heisenberg's Uncertainty Principle and the aforementioned wavefunction collapse.
What created the Big Bang
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