Articles

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Football sweepstakes: Levelling the playing field

With just a few months to go until the UEFA European Cup, here's how you can make your office sweepstake a lot fairer and more exciting.

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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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A strange definition of perfect

Perfect numbers have foxed mathematicians for over 2000 years. Here's a quick look at the long struggle to find them.

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Why are sunsets red?

The answer comes from the physics of waves.

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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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