Season 1 · Session 02
No Universal Now
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When something happens 'now' far away, is it really happening now?
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Two observers can disagree about which of two distant events came first, and both be correct. If there's no fact about the order, what happens to the idea of a single shared 'now'?
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The disagreement only ever covers events too far apart to affect each other. Cause and effect always keep their order. Why is it reassuring that nature protects causality but not simultaneity?
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We move through daily life certain that 'now' is the same everywhere. The physics says that's a convenient local habit, not a cosmic fact. What does it change to learn the present is not universal?
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How do you feel about this science and its understanding of reality?
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