Timeline for Why cannot Paul be the observer? (Questions about Twin Paradox)
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| Apr 13, 2017 at 12:39 | history | edited | CommunityBot |
replaced http://physics.stackexchange.com/ with https://physics.stackexchange.com/
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| Jun 20, 2016 at 11:33 | history | answered | John Rennie | CC BY-SA 3.0 |