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**Need clarification on "quantum indeterminism"**

Hi,

I should start off by saying that I am not physicist, nor am I a physics student, however I have lately been in need of some clarification on basic quantum physics.

My question is this, does quantum mechanics contradict the idea of cause-and-effect?

I have read about Heisenberg's uncertainty principle, but I am confused as to whether it is stating that there is only one "real" possible location for a quanta, or that our trying to observe said quanta is what causes the "uncertainty"?

Perhaps another way of saying it would be: if we repeated the same experiment under the same conditions on the quantum level, could we possible end up with different results? (Hence "indeterminancy.")

Sorry if this sounds incoherent, as I stated earlier, I am no physicist.

Any answers (particularly ones with references) are appreciated in advance.