## probability

**Andrew Stickland**explores the dangers that face the unwary when using a single number to summarise complex data.

**information theory**to explain how to cut down the number of tests significantly, by pooling samples of blood.

**John D. Barrow**challenges readers to estimate the errors that aren't found from the errors that are.

**John D. Barrow**challenges readers to estimate the errors that aren't found from the errors that are.

**John Haigh**shows us how to use probability to answer these and other questions, and explains the implications for the rules of the game.

**Mark Wainwright**meets the pair and finds out how they did it.

**John Webb**takes us through some of the mathematics involved, introducing us to some of the colourful characters who led the way.