In 1935, Austrian-born physicist Erwin Schrödinger described a thought experiment that magnified a glaring problem at the heart of quantum mechanics. To this day, the problem remains, summed up by ...

The universe is a strange, beautiful place—rich with possibilities and governed by the odd rules of quantum mechanics. One of the most mind-bending ideas from this realm is the many-worlds ...

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For more than a decade, physicists have argued (and counter-argued) that a subatomic particle can be separated from certain quantum properties, such as its spin—a phenomenon known as the Cheshire cat ...