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Letter writing, hospital visits, and getting the family active are among the topics of discussion in this issue's Dear Dirichlet advice column

Vote for your favourite geometry instrument

Pythagoras gave us so much more than a² + b² = c²

Be in for a chance to win a £100 goody bag if you can solve our fiendish crossnumber

Why voting systems can never be fair

Something for you to solve during the post-Christmas lull