Seven is a lucky number. No, seriously, it is!
What's your chance of winning the lottery?
Triangles do it, squares do it, even hexagons do it — but pentagons don't. They just won't fit together to tile your bathroom wall.
This year's PISA results have caused predictable headlines, but do the statistics add up?
How to colour a map
Make a fractal in infinitely many simple steps!
When Archilles and the tortoise race, who will come second? Find out behind door number two!
How can the number one help spot fraud in tax returns, elections, or mistakes in data sets? Find out behind door number 1!