- JR RISC OS Note Book
- JR Nudos Mostrar y Contar
- List of Knots
- Tipos_de_nudos
- RD Laing's book of Knots
- Lotsa knotsa
- Blots Pen and Ink Supplies
- Algebra
- Mathematical Jokes
- Pi to a million places 3.141592..

There are 10 types of people in the world:

those who understand binary, and those who don't.

Dick the shepherd sends his dog Shep into a field to count the sheep. The dog runs around and comes back. "So, how many?" "40," says Shep. "But I only bought 38!" "Sorry" says Shep "I rounded them up."