How much can we know of the world? Some believe we can go all the way and find the answers to the most penetrating questions, at least those concerned with the natural world. Others think there is only so much we can know, that there are some very concrete limits to how much information we can gather about reality. These limits are not just a consequence of our brains or the tools we use to extract knowledge. They are Nature’s trademarks.

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The new quantum mechanics imposed two fundamenta...
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