I've recently picked up and re-read this book as a nice little way to switch off before bed time.

The premise is the analyse how mathematics can be used to give insight in to common experiences such as the bunching of buses (apparently it is extremely unusual for three buses to bunch together, and requires a very long route and lots of passengers).

Covering a range of topics from probabilities to why clever people get things wrong, this is a great introduction to the subject with only a smattering of formulae, all of which are well explained. ( )