Why Time Only Moves Forward _ The Sleepy Scientist
"The past is gone, the future not yet here. But why does time always flow the way it does for us?" If we look at the laws of physics, they appear to be time-symmetric—they work just as well backward as forward. Yet we know from experience that time only flows one way.The answer may lie in a concept called entropy. In a closed system, entropy can only increase or stay the same; it never goes down. This "arrow of time" explains why ice melts but doesn't spontaneously freeze, why coffee mixes with milk but never unmixes. The universe started in a low-entropy state and has been moving toward…
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