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Dear Dirichlet, Issue 22
Rhythm, rivers and rises pollute the prof's postbag this issue
Oπnions: In defence of toy models
Calum gets on his soap box about toy models
I’m counting on it
Joe Celko looks at four different abacuses used throughout history
The scutoid: a geometric building block of life
In 2018, scientists discovered a new shape that is essential to multicellular life
Top ten vote issue 06
Vote for your favourite mathematical celebration day
Breaking out of the prisoner’s dilemma
What happens if you play the prisoners' dilemma against yourself?