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Time is a funny thing. For as much as we rely on it for, well, everything -- we still have a hard time grasping the concept of it. And we aren't just talking about losing track of an hour or two because you're working hard or having a good time. No, we're talking about literally losing track of decades or longer because our brains apparently can't quite grasp the magnitude of timespans.
It helps to have some useful comparison points, such as: