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Dear Dirichlet, Issue 18
Phone assistants, duplicating pastries, and being a 10 anywhere else are among the topics of discussion in this issue's Dear Dirichlet advice column
Top Ten: Mathematical clothes
The definitive chart of the best matrices
Adopt a polyhedron
Mara Kortenkamp, Erin Henning and Anna Maria Hartkopf give us a tour of Polytopia, a home for peculiar polytopes
The Chalkdust Christmas card
This year's Chalkdust puzzle Christmas card
Why I hate an empty bus stop
How the queue size tells you when the next bus is coming
Fun with water bells
Explaining how surface tension makes water form surprising shapes