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What is a square?

If a shape has equal sides with 90 degree angles between them then it's a square, right? Well, not quite...
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Triangular number patterns

There are triangular numbers hiding all over the standard multiplication table! Find out how to discover them in this article!
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Perfectly even

After 2000 years of searching we only know of 51 perfect numbers and they're all even. What else do and don't we know about these rare and precious jewels of maths?

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Perfectly odd

Nobody has ever found an odd perfect number. So do they exist at all and, if yes, what do they look like?
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Sexual statistics

David Spiegelhalter's new book Sex by numbers takes a statistical peek into the nation's bedrooms. In this interview he tells us some of his favourite stories from the book. Read the article or watch the video!