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If you'll open your textbook to page... oh, the cat's sitting on it

We review the fourth of this year's nominees for Book of the Year

Moving house? Who you gonna call?

Game shows, flight and social media bots are among the problems solved in this issue's Dear Dirichlet agony aunt column

What is pi? How do we define it and who first thought of it? We explore the history of this quintessential mathematical constant.

Win £100 of Maths Gear goodies by solving our famously fiendish crossnumber