Matt Parker is some sort of unholy fusion of a prankster, wizard and brilliant nerd - clever, funny and ever so slightly naughty -- Adam Rutherford, author of CREATION Essential reading * Observer * Matt Parker is a lovely, funny, big, dork -- Ben Goldacre Shows off maths at its most playful and multifarious, ranging from classics like knot theory and ruler-and-compass constructions to more whimsical topics like the topology of beer logos and error-correcting scarves -- Jordan Ellenberg, author of HOW NOT TO BE WRONG This is the best book on recreational mathematics since Martin Gardner's My Best Mathematical and Logic Puzzles -- Harold D. Shane, Mathematics Emeritus, Baruch Coll., CUNY * Library Journal *