Newton's Principia

Plus Advent Calendar Door #21: How many dimensions are there?

Could there be more than three?

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Plus Advent Calendar Door #20: Strings to the rescue?

A possible way of resolving the greatest problem of physics.

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String theory: From Newton to Einstein and beyond
Over the last few years the words string theory have nudged their way into public consciousness. It's a theory of everything in which everything's made of strings — or something like that. But why strings? What do they do? Where did the idea come from and why do we need such a theory? David Berman has an 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?
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