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Does light have weight? Newton thought so. His laws predicted that gravity would bend light, two centuries before Einstein's revolution.
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It might not be as familiar as the circle or parabola, but it's definitely worth getting to know the hyperbola!
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This week would have been the 100th birthday of Martin Gardner, who is deservedly credited with turning on several generations of people worldwide to the pleasures of maths! To mark the occasion here are some favourite puzzles that, apart from being fun, also lead to some serious maths.

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