Learn easy mental maths tricks for percentages, multiplying by 11 and the Rule of 72 to boost everyday confidence.

Every time you pay online, your data is protected by a maths problem nobody has proved is unbreakable. Here is what that means, and why the world is already preparing for the worst.

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What do a 20th-century physicist, an 18th-century statistician and an ancient Greek philosopher have in common? They all knew how to extrapolate with incredible accuracy. Columnist Jacob Aron explains ...