I watched again an episode 'Through the Wormhole', presented by Morgan Freeman dealing with whether time is eternal or not. In it mentioned a form of quantum entanglement where future measurements affect past measurements. This is certainly a very intriguing concept but I thought that making a measurement would collaspe the wave function in the first place. In any case the idea of the future affecting the past came from Israeli theoretical physicists Yakir Aharonov. However after some background reading Aharonov's theory is itself based on something quite controversial called weak measurement. My view is that if you want to measure something its best to measure it properly or not measure it all.
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