Past. Present. Future. In physics, they are all the same thing. But to you, me, and everyone else, time moves in one direction: from expectation, through experience, and into memory. This linearity is called the arrow of time, and some physicists believe it only progresses that way because humans, and other beings with similar neurological wiring, exist to observe its passing. The question of time’s arrow is an old one. And to be clear, it’s not whether time exists, but what direction it moves. Many physicists believe it emerges when enough tiny particles-individually governed by the weird rules of quantum mechanics- interact, and start displaying behavior that can be explained using classical
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