Messages let you spread the word or keep it to yourself. This book shows you how to send messages and how to tune in to other people's messages, too. You can talk to friends next door through a speaking tube or send them signals with a buzzer. You can build a radio or a message track. You can set traps for spies or dig a secret hiding place for an important message. Messages can be hidden in fortune cookies or scattered far and wide next time you fly a kite.
