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James Owen Weatherall

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    Is Quantum Theory About Reality or What We Know?

    Does the quantum state ultimately represent some objective aspect of reality, or is it a way of characterizing something about us, namely, something about what some person knows about reality?Photograph by Ben Scholzen / Flickr Physicists know how to use quantum theory—your phone and computer give plenty of evidence of that. But knowing how to […]

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    Is Quantum Theory About Reality or What We Know?

    Physicists know how to use quantum theory—your phone and computer give plenty of evidence of that. But knowing how to use it is a far cry from fully understanding the world the theory describes—or even what the various mathematical devices scientists use in the theory are supposed to mean. One such mathematical object, whose status […]

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    Why Rotation Makes No Sense Sometimes

    What is orbital rotation? The basic picture is clear enough: One body is at rest, while the other follows some circular or elliptical path around it. The trouble is just to figure out which body is which. If you’re standing on the surface of the earth, it appears that the sun slowly orbits around you […]