A neat experiment at the University of Queensland in Australia in 2018 showed just how puzzling this all is by demonstrating that at the quantum level, events occur with no definite causal order. Basically, in physics, causality means that if an event A takes place before an event B (in some frame of reference) then A may or may not have influenced or even caused B. But the later event B could not have influenced or caused event A. At the quantum level, this sensible causality was shown to break down. This has led some physicists to argue that the arrow of time really does not exist at the
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