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Why Time Does Not Flow | Leonard Susskind

Time feels like it is flowing. You sense it moving from past to future, carrying everything with it. But modern physics suggests something far more unsettling: time does not flow at all. Understanding this isn’t just philosophical curiosity — it changes how you see reality, causality, entropy, and even your own existence.

In this video, we examine why the idea of flowing time collapses under the scrutiny of fundamental physics. In relativity, time is a coordinate — not a river. In quantum mechanics, the deepest equations work perfectly without a moving present. The “now” you experience is not written into the laws of the universe. It is a feature of how information is processed inside physical systems like your brain.

When we remove metaphor and look only at the mathematics, we find something astonishing: the universe does not update itself moment by moment. It is internally consistent across spacetime. Change exists. Motion exists. Entropy increases. But time itself does not flow.

This video carefully explains:

• Why relativity eliminates the idea of a universal present
• Why fundamental equations are time-symmetric
• How entropy — not time — creates the arrow we experience
• Why the “block universe” model fits physics better than intuition
• How consciousness creates the illusion of temporal flow

Key insights you’ll gain:

Flow requires a second time dimension — and physics provides none.
The present moment has no special status in fundamental theory.
The arrow of time comes from entropy gradients, not moving time.
Causality survives even if time does not flow.
The past and future are regions of spacetime — not things that vanish or wait to exist.
As physicists often say, “The laws of physics do not privilege the present.”
Einstein once remarked, “The distinction between past, present and future is only a stubbornly persistent illusion.”
And in modern cosmology, one guiding principle remains clear: “Consistency of laws across spacetime is more fundamental than human intuition.”

This topic matters now because we live in a world shaped by rapid change — technological, environmental, and global. Understanding time properly clarifies how we model climate systems, predict quantum events, and formulate long-term policy. Clear thinking about time improves clear thinking about everything else.

If you are a physics student, researcher, engineer, philosopher of science, policy analyst, or simply someone who refuses to accept comforting illusions without examination — this video is for you. If you care about deep structure rather than surface appearance, stay with this discussion until the end.

The goal here is not to mystify reality, but to simplify it — to remove unnecessary assumptions and show what the equations actually say. When we let go of the metaphor of flowing time, we gain something more powerful: a universe that is coherent, elegant, and complete without needing a cosmic clock to tick.

If you value rigorous thinking and clear explanations of deep physics, subscribe to the channel. Share this video with someone who believes time is obviously flowing. Stay connected for more discussions that challenge intuition and align it with reality.

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Disclaimer:
This channel is not officially affiliated with Leonard Susskind. The content is independently created, inspired by his educational style, and intended solely for educational purposes.