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Is time an illusion?

Great Mysteries of Physics

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How to Make Sense of Time Flowing Backwards?

Until you actually make a measurement of a quantum system, such as finding out a particle's location, it isn't either here nor there. That's a mix of many different locations at the same time, all with different probabilities. Another weird thing in the theory is that a particle can be entangled or spookily connected with another particle - this is called non-locality. But if we allowed for cause and effect to flow backwards, at least in the quantum realm, with a future literally influencing the past, quantum mechanics could be both real and local.

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