We got our feet wet with special relativity, so now let's head to the deep end! Remember in Interstellar when what's his face went down to that one planet and Good Will Hunting was there and they fought and when what's his face went back a bunch of time had passed? That's time dilation! Pretty neat plot device if you ask me. Time passes at different rates for different observers. It's as true as anything can be. Check it out! Bring your twin for some fun with paradoxes.

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