Even if you're not a physicist, chances are that you're familiar with Erwin Schrödinger's cat.
In his famous Schrödinger's cat thought experiment, a cat inside a box is both dead and alive until the box is opened, and illustrates (just one of the) paradoxical things about quantum mechanics.
But what if instead of one cat, there are two cats?
Find out what happens in this article by Davide Castelvecchi over at Nature.
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The more we think we know, the more we know we don't know.
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