The mid night clock 5 Beat the calculator 11 Think. of a number 39 Magic squares 48 Card tricks 63 The cleverest trick in this book. 86 The fabulous flexagons 100 Coin tricks 114 Number tricks 133 The dragon curve 157 With a little bit of luck! 163 The missing cent 171 What sort of person are you? 179 The magic ball 181 How to check a till receipt quickly 187 The Duchess's missing head 194 The impossible path 203 The last laugh 207