Even if you might not fully understand it, you've probably heard of Schrödinger's cat. It's that old thought experiment where a cat inside a box is both alive and dead, and it's supposed to illustrate the absurdity of quantum mechanics. Recently, a pair of physicists gave it a reboot: They added a second cat in a second box. What happens when two observers open both of those boxes is very bad news for quantum mechanics.
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Written by Ashley Hamer October 4, 2018
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