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" ... If our particles, coins in this case, actually have an inherent property within them, a "headness" or "tailness" so to speak, we would only just think that these coins could be heads or tails until we flip them. The idea that these coins have an inherent "headness" or "tailness" is called the hidden variable theory. According to the hidden variable theory, these entangled coins decided whether or not they would be heads or tails when they were in contact with one anther. This "headness" or "tailness" remains hidden from us until we choose to measure it. ... "