More from Chalkdust
- Sophie Maclean and David Sheard speak to a very top(olog)ical mathematician!
- David Sheard sets the third puzzle. Can you solve it?
- David Sheard explores the rich mathematics and history behind the Apollonian packing, and the cover of issue 11
- Factorisation is often used in cryptography. But there's something even simpler which turns out to be just as hard.
- Santa's sack of scientific surprises