In the 1930’s when scientists, including Albert Einstein and Erwin Schrödinger, first discovered the phenomenon of entanglement, they were perplexed. Entanglement, disturbingly, required two separated particles to remain connected without being in direct contact. Einstein famously called entanglement “spooky action at a distance,” since the particles seemed to be communicating faster than the speed of light.
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Source: Phys.org