What is time?

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Time is something with which we have tremendous experience, but a detailed and scientific definition of time and how it works eludes even the most educated of minds. In this video, Fermilab’s Dr. Don introduces some of the ways in which time remains puzzling. Time dilation: https://www.youtube.com/watch?v=svwWKi9sSAA Twin paradox (with math): https://www.youtube.com/watch?v=GgvajuvSpF4 Twin paradox (without math): https://www.youtube.com/watch?v=noaGNuQCW8A Fermilab physics 101: https://www.fnal.gov/pub/science/particle-physics-101/index.html Fermilab home page: https://fnal.gov

Published 2025-06-18 · Watch on YouTube ↗
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