Alex Bellos is brilliant on all things mathematical. He has a degree in Mathematics and Philosophy from Oxford University. His bestselling books Alex's Adventures in Numberland and Alex Through the Looking-Glass have been translated into more than 20 languages. He is the co-author of a mathematical colouring book, Snowflake, Seashell, Star, and he has launched an elliptical pool table, LOOP. He writes a popular maths blog and a puzzle blog for the Guardian.