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

Can you solve it?

Humbug sets the fourth puzzle. Can you solve it?

Negative polygons and other mathematical creations

How crime science, and the maths it uses, is helping the police fight crime

Paper cups do not follow a hexagonal pattern and the cones do not meet at a single point, but they do make a gigantic sphere