There was a scientist named Erwin Schrodinger who put a cat in a box and you can not see the cat so the cat is dead and alive for say. This is popular with the show the Big Bang Theory and they use the phrase to describe relationships between the group of friends.
Sheldon: Your relationship with Leonerd is like Schrödinger's Cat.
Sheldon: Your relationship can be thought of as good and bad to find out you need to open the box.
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