Time entropy is the arrow of time – the observation that events unfold in one direction. Entropy tends to increase. A hot cup of coffee cools. Eggs crack; they do not uncrack. People are born, live, and die; not the other way around. Cause comes before effect, and memory points backward, not forward.
Now add quantum mechanics.
In the early 1900s, physicists discovered that matter does not behave like simple little bullets. Instead, they sometimes act like particles and sometimes like waves. In 1927, experiments confirmed this strange wavicle behavior. The conclusion was that objects exist in a spread of possible states until measured.
In 1935, Schrödinger entered the story with his imagined cat in a box, tied to a quantum event. According to the strange math, before anyone looks, the cat appears to be both alive and dead in a kind of unresolved possibility. Schrödinger meant this as a warning: if all this is taken too simply, it leads to absurd-sounding conclusions.
The response was essentially: yes, it is weird. And yes, it is happening.
Then, in 1957, Hugh Everett offered the Many Worlds interpretation. Maybe the universe does not collapse into one result. Maybe all possible outcomes continue, each in its own branch of reality. In one branch, the cat lives. In another, it dies. Forward-only time entropy implies this is possible. Some even say likely.
Time entropy is an empirical truth. We see the arrow of time everywhere. But the Many Worlds interpretation is speculative and falls into the irrational category. It is one possible way to explain what quantum theory means underneath the math.