Multiverses are everywhere.
Movies, popular science articles, philosophical debates, Family Guy episodes.
At one time or another, we’ve all been invited to imagine copies of ourselves running around in some other dimension, living out a life almost but not quite identical to our own.
But why do people think multiverses exist in the first place?
As it happens, I spent the first half of my time in grad school trying to figure out the answer to this question — and the second half trying to figure out how to explain it to people who don’t have a physics degree.
So without further delay, here’s a 100% math-free walkthrough of the multiverse theory known as Many Worlds quantum mechanics.
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