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The Twin Paradox (special relativity). Every time I wrap my head around the idea I lose it a few weeks later an it's a mystery all over again.
Twin Paradox TL;DR: Identical twins—one stays on Earth, the other rockets off near light speed and returns. Relativity says time slows for the traveler, so they age less (e.g., returns 20 while sib is 50). "Paradox" cuz from traveler's view, Earth seems to move, but acceleration/turnaround breaks the symmetry, so no real contradiction. Mind-bendy Einstein stuff. 🚀