The coolest physics thing that I know keeps changing over time. But here is one that is extremely fascinating ( and also exaggerated for the effect ; but true! ):
Person living at the top of a skyscraper experiences time faster than one at the bottom
It is a known fact that the higher you are in the earth’s ** atmosphere, the lesser the effect of gravity is.
But the lesser the effect of gravity is, the faster the time ticks.
By how much you ask? Even if you live on the top floor of the Burj Khalifa your entire life, you would have aged more only by a few milliseconds than your friends at the bottom.
( Sure, doesn’t seem like much, but hell would break loose if we don’t consider this on the bigger scale of things )
This is known as Gravitational time dilation and is at the foundations of General Theory of Relativity. (More about this in an upcoming post)
Have a great day and thanks for asking!
EDIT: ** Lets just say hypothetically the earth is not spinning( just to ignore special relativistic effects) and we are looking at only the effects of height.