In our everyday lives, things seem to happen in a particular order. Things that happen to us seem to be triggered by earlier events. The upset stomach we have in the evening is caused by that third taco we had at lunch. Doing well on a final exam is thanks to studying the entire week before. Our life follows a series of causes and effects. But is it ever possible to go the other way around? Could an effect ever trigger a cause? In physics, this is known as retrocausality, and it could help us understand some of the deepest problems in modern physics.

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