Which countries have the most naturally athletic populations?

Alison and Charlie are playing a game. Charlie wants to go first so Alison lets him. Was that such a good idea?

How well can you estimate 10 seconds? Investigate with our timing tool.

Play around with sets of five numbers and see what you can discover about different types of average...

Here is a machine with four coloured lights. Can you develop a strategy to work out the rules controlling each light?

What's the largest volume of box you can make from a square of paper?