More from Chalkdust
- Sam Harris looks at how Pingu and his friends can stay cosy
- We talk to the Fields medallist about his life, his work and his advice to his younger self.
- Make your own scatterer from some old Christmas decorations
- Vote for your favourite picture of a scorpion
- Behind today's door... The Chalkdust guide to Christmas presents
- Teaching a bunch of matchboxes how to play tic-tac-toe