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Quantum particles are in a superposition of all possible states (a wave). If the position of the particle is undefined, how does the system determine when to collapse?

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Quantum particles are in a superposition of all possible states (a wave). If the position of the particle is undefined, how does the system determine when to collapse?	1
When we say the universe is 13.8 Billion years old, from who’s perspective is that number measured?	1