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

James Christian and George Jensen zoom in, out, in, out, and tell us what it's really all about

We review the sixth of this year’s nominees for the Book of the Year

Did you solve it?

... and how Chalkdust played a role in one of them

After 100 years, a key postulate of the third law of thermodynamics has been proven. We meet Lluis Masanes, one of the researchers responsible.