Kjartan Poskitt (that's me) - author of over 80 books including the Murderous Maths series, Agatha Parrot, The Runaway Pea, puzzle, code and magic books, biogs of Isaac Newton and Houdini, five musical stage shows including Henry The Tudor Dude and ... oh I can't remember the rest. I'll just have to type my name into Amazon and look them all up. Played lots of pub pianos very loudly, presented science and maths on BBC tv, and I've done about 2,500 maths/author shows at festivals and schools. Won a few awards but not enough to brag about. Have worn a red tartan scarf for over 35 years. Dunno why, I just have.