Entropy is sometimes called the "arrow of time".I think it has something to do with entropy, but I don’t know much beyond that.
This is because no process is reversible with 100%
efficiency (on the macro level). Id est, there are always
inefficiencies resulting in loss of available energy.
In short...everything runs down. If time were to reverse,
it would mean violating the laws of thermodynamics.
An example....
When you're on a swing, each up & down cycle
results in friction with air & within the rope, which
is lost as heat to the environment. This heat is
at a temperature which won't allow the energy to
be recovered. So your swing amplitude & speed
inexorably decrease. All processes work this way.
Parenthetical aside....
I did once experience what stoppage of time would
feel like. It happened about 2 hours into the movie,
The Irishman.
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