Richard Feynman Explains Why the Past Hasn't Really Gone Away

Описание: You remember yesterday. But you can’t remember tomorrow. Why is that?
It feels obvious — almost too obvious to question. The past feels locked in place. The future feels uncertain and open. We feel regret about what already happened and hope about what might come next. Time seems to move in only one direction.

But here’s the part that really messes with your head: every fundamental law of physics works just as well in reverse. Gravity doesn’t care which way time flows. Electromagnetism doesn’t either. Even quantum mechanics runs perfectly backward. Flip the equations, reverse the motion — everything still checks out.

So why does reality only move forward?

In this video, inspired by Richard Feynman’s legendary lecture “The Distinction of Past and Future,” we dig into the real answer — and it’s not hidden in the laws of physics themselves. The key lies in **probability**. The universe began in a highly ordered state and has been slowly unraveling ever since. That relentless drift toward disorder is called **entropy**. And that’s what gives time its arrow.

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*Timestamps:*
0:00 – Introduction
3:25 – Physics Works Backwards, Reality Doesn’t
8:09 – Example #1
14:40 – Why the Universe Started Ordered
23:35 – Example #2
31:39 – Why Time Only Goes Forward

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