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Plus Advent Calendar Door #21: How many dimensions are there?
Could there be more than three?
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A possible way of resolving the greatest problem of physics.
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String theory is a theory of everything in which everything's made of strings — but why strings? What do they do? Find out in our equation-free introduction for beginners.
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Stolen science
A rare first edition of Newton's mathematical masterpiece has been stolen! And is Newton the Greatest Briton?