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Most of us have heard of the famous double-slit experiment. Usually it's played out in a lab in seconds. But there's one version, dreamt up by physicist John Archibald Wheeler, that can be played out over much of the galaxy, over millions of y

The Double-Slit experiment makes an appearance in every high school physics classroom, and for good reason. It gives students their first taste of the truly wild - although many people have explanations for it. Whatever the explanation, the results show us that the world is a stranger place than we have thus far assumed it to be.

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