These are the show notes for episode 18 of the Travels in a Mathematical World podcast. 18 is the only number that is twice the sum of its digits. More about the number 18 from Number Gossip.

For episode 18 I visited the Science Museum where Jane Wess told me about the mathematics collection. To accompany this episode there is a video of Jane demonstrating Napier’s Bones.

You can find out more about my work with the IMA by following me on Twitter, reading this blog and visiting www.ima.org.uk/student.