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Metallic numbers: Beyond the golden ratio

You've heard of the golden ratio but have you heard of the silver ratio? And all its other cousins called the metallic numbers? Read this article to meet the family!
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The power of ants

Find out how these humble animals have inspired computer algorithms to solve complex real-world problems.
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Our changing picture of gravity

To celebrate the recent centenary of the first major test of Einstein's general theory of relativity, we look back over how our picture of gravity has changed.
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The PEMDAS Paradox

It looks trivial but it keeps going viral. What answer do you get when you calculate 6÷ 2(1+2)? David Linkletter explains the source of the confusion.

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Mysterious 6174

Start with your favourite four-digit number, follow these simple steps, and you'll never guess what happens next!