Even his houseplants will have grown more! The result? The mountain-dweller will have aged more and lived longer than his pal from the flatlands. One of them goes to live on a beach and the other at the top of a mountain. Take a simple thought experiment – two friends of the same age part company. It’s not just time that slows down when measured at a lower level – all processes do. Placing one clock on the floor and another on a table has the same effect: the differences are minuscule, and you’d need a precision timepiece to prove it, but the second timepiece will always run faster. Compare two clocks, where one is placed at sea level and the other high up in the mountains, and you’ll find the latter runs faster. In reality, time passes at different speeds in different places. In everyday life, we see time as a uniform forward movement – something that just happens, like the ticking of an eternal clock entirely beyond our control. After all, if you trust your eyes alone, you’re likely to end up believing the world is flat. That’s one of the first lessons of the sciences.
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