Well, if there is an effect, there must have been cause. It’s common sense. It’s as obvious as saying that something cannot be in two places at the same time. Or that something which is a particle cannot be a wave at the same time. Or that changing something in one place instantaneously alters something somewhere else. And no effect can be faster than the speed of light.
Objects of the quantum world – according to quantum theory – no longer move along a single well-defined path. Rather, they can simultaneously take different paths and end up at different places at once.
phys.org/news/2015-01-atoms.html
It’s a fundamental property of the universe, and one that continues to blow people’s minds: photons behave as both particles and waves, matter and energy. Photons aren’t alone in this—every elemental particle is thought to act the same way—but they are perhaps the most well-known example.
pbs.org/wgbh/nova/next/physics/physicists-finally-see-light-as-a-particle-and-a-wave-at-the-same-time/
When observed, Photon A takes on an up-spin state. Entangled Photon B, though now far away, takes up a state relative to that of Photon A (in this case, a down-spin state). The transfer of state between Photon A and Photon B takes place at a speed of at least 10,000 times the speed of light, possibly even instantaneously, regardless of distance.
livescience.com/28550-how-quantum-entanglement-works-infographic.html
Can I suggest that common sense (it’s obvious!) is not a very good method of determining esoteric matters such as life, the universe and everything.