Abstract
Experience teaches us that some processes in life are irreversible. We cannot, for example, travel backwards in time and relive the past, which is why we laugh when we watch a movie run in reverse and see people walking backwards. But the strange fact is that all the fundamental laws of physics are the same, or “symmetric”, whether time runs forwards or backwards. Imagine a coffee cup being knocked off a table and smashing on the floor. No law of mechanics would be violated if the cup were suddenly to reform: there is nothing in principle to stop the broken pieces getting back together, the spilt coffee going back in the cup, and the cup jumping back up onto the table. It is just that there is no chance of this happening.
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