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Einstein's twin paradox explained - Amber Stuver
6:16
YouTubeTED-Ed
Einstein's twin paradox explained - Amber Stuver
Follow two astronauts into outer space to explore time dilation and Einstein’s theory of relativity through the Twin Paradox thought experiment. -- On their 20th birthday, identical twin astronauts volunteer for an experiment. Terra will remain on Earth, while Stella will board a spaceship. Stella’s ship will travel to visit a star that is ...
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9/11: Plane crashes into the north tower of the World Trade Center
BBC
Sep 1, 2011
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