More from Chalkdust
Notched edge cards
Joe Celko makes a database from card and knitting needles
Significant figures: Sofya Kovalevskaya
Nora Koparan tells the story of the first female professor of mathematics
Ode to Newtonian mechanics
(after Sonnet 130)
Prize crossnumber, Issue 08
Win £100 of Maths Gear goodies by solving our famously fiendish crossnumber
Mathematics for the three-fingered mathematician
Robert J Low flips one upside down.
Pretend numbers
20 questions, the axiom of choice and colouring sequences.