Talking on the phone, text-messaging, chatting on the internet and emailing today, there are many ways to send and receive information! But there was a time when communicating was not so easy. In fact many thousand years ago, humans did not even know how to speak! Join the ever-inquisitive Teri and the immensely knowledgeable Green Genius in their attempt to trace the journey of communication in this book. Books in this series: Science in our Environment: Animal Kingdom Science in our Environment: Communications Science in our Environment: Galaxies, Stars, Planets Science in our Environment: Human Body Science in our Environment: Light, Sound, Energy Science in our Environment: Plant Kingdom