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Post Closed as "Duplicate" by WillO, Norbert Schuch, Kyle Kanos, Cosmas Zachos, rob
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Norbert Schuch
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Quantum entanglement, how do we know there was no spin?

Im not a scientist, so go easy on the explanation!

As I understand it we can create two entangled particles. The entangled particles have a spin property which is opposing. When we measure one of the particles for spin we get a result and we can deduce the spin direction of the unmeasured particle. All makes sense, but...

How do we know that the entangled particles didnt already have spin before being measured?