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Books, business and barns are the topics readers have sent in to the professor's postbox this issue

Humbug sets the fourth puzzle. Can you solve it?

Andrei Chekmasov explores order and infinity

Think outside outside the box in our spring 2018 issue. No more tennis puns, primes mod 4, plus all your favourite regulars.

We chat to the chief scientific advisor to the Home Office about the role of scientists and mathematicians in politics

Something for you to solve during the post-Christmas lull