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

You remember yesterday. But you can't remember tomorrow. Why? This seems obvious—but it's actually one of the deepest mysteries in physics. The past feels fixed. The future feels open. We feel regret about what happened, hope about what's coming. Time flows in one direction. But here's what will break your brain: every fundamental law of physics works perfectly in both directions. Gravity, electromagnetism, quantum mechanics—run them backwards and they work just fine. So why does the universe only go forward? In this video, inspired by Feynman's legendary lecture "The Distinction of Past and Future," we explore the shocking answer. It's not in the laws—it's in PROBABILITY. The universe started ordered and has been falling apart ever since. That's entropy. That's time's arrow. 📚 SOURCE: "The Feynman Lectures on Physics" - The Messenger Lectures (1964) Chapter: "The Distinction of Past and Future" 🔗 https://www.feynmanlectures.caltech.e... ------------------- credits: Wavelet By Thierry Dugnolle - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index... Dancing gravitational field By Thierry Dugnolle - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/wiki/Fi... Indeterminacy principle By Thierry Dugnolle - Own work, CC0, https://commons.wikimedia.org/wiki/Fi... NASA, ESA and the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration; Acknowledgment: Davide De Martin and Robert Gendler , https://science.nasa.gov/mission/hubb... https://www.tng-project.org/media/ NASA's Goddard Space Flight Center, Producer: Scott Wiessinger (USRA), https://svs.gsfc.nasa.gov/12102/ NASA’s Goddard Space Flight Center, Producer: Chris Smith (USRA), Animator: Chris Smith (USRA), Science writer: Francis Reddy (University of Maryland College Park), https://svs.gsfc.nasa.gov/13511/#medi... NASA's Goddard Space Flight Center, Producer: Scott Wiessinger (eMITS), Science writer: Francis Reddy (University of Maryland College Park), Animator: Brian Monroe (USRA), Scientist: Eric Burns (Louisiana State University), Visualizer: Scott Wiessinger (eMITS), https://svs.gsfc.nasa.gov/14916/#medi... NASA's Goddard Space Flight Center, Producer: Scott Wiessinger (USRA), Science writer: Francis Reddy (Syneren Technologies), Animators: Brian Monroe (USRA), Scott Wiessinger (USRA), Scientists: Julie McEnery (NASA/GSFC), Brad Cenko (NASA/GSFC), Eleonora Troja (University of Maryland College Park), Artist: Aurore Simonnet (Sonoma State University), Graphics: Francis Reddy (University of Maryland College Park), https://svs.gsfc.nasa.gov/12740/#medi... National Science Foundation/LIGO/Sonoma State University/A. Simonnet, https://svs.gsfc.nasa.gov/12740/#medi... NASA's Goddard Space Flight Center, Producer: Scott Wiessinger (eMITS) Science writers: Francis Reddy (University of Maryland College Park) Jeanette Kazmierczak (University of Maryland College Park) Scientist: Brad Cenko (NASA/GSFC) Narrator: Scott Wiessinger (eMITS), https://svs.gsfc.nasa.gov/14738/#medi... 🎬 Stock Footage: Licensed from Envato Elements: https://elements.envato.com ------------------- Timestaps: 0:00 - Intro 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 ------------------- ⚠️WARNING: This channel isn't officially connected to Richard Feynman or his estate. We're here to share his incredible way of explaining physics with a new generation who never got to learn from him directly. This isn't his voice — it's our tribute to his teaching style, created purely for education and inspiration. No impersonation intended, just deep respect for one of history's greatest teachers. 🙏 All content is created to inspire, educate, and encourage reflection. This channel follows YouTube’s monetization policies, including clear labeling of synthetic media. This channel has no official connection to Richard Feynman, his estate, or Caltech. We are independent educators using AI technology to make Feynman's teachings more accessible. What we do: Transform Feynman's lectures and writings into engaging video format using AI voice synthesis, staying faithful to his original words and style. What we DON'T do: Claim this is actually Feynman speaking, add our own theories, or misrepresent his ideas. -----