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Time is a dimension, but not like space
The fabric of spacetime is four-dimensional, with three for space and only one for time. But wow, time sure is different from space!
It’s why, if you ask yourself to draw a path that describes the shortest distance between any two points, most of us will give the same answer that Archimedes gave more than 2,000 years ago: a straight line. Most of us learn it as children: cutting across a grassy area to meet a friend or family member, rather than staying on the (often right-angled) paths or sidewalks that would require more time and more steps to traverse. However, each individual observer will see time pass at the same rate as long as they remain in their own reference frame: one second-per-second, even though when they bring their clocks together after the experiment, they’ll find that they no longer agree.
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