Build Your Own Chain Reaction Machines: How to Make Crazy Contraptions Using Everyday Stuff--Creative Kid-Powered Projects! Paul Long
Step into an infinite world of stories
Throughout history, army generals, spies, and even scientists have guarded information through secret codes. Find out how they did it and learn how to create your own secret codes. You and your friends can share secrets that will leave everyone else scratching their heads.
© 2020 Capstone Press (Audiobook): 9781476572352
Release date
Audiobook: February 5, 2020
English
International