Sh-h-h-h-h-h Top Secret...
All the Activities arecompletely safe and can be done with everyday stuff from around thehouse..
Crack the code of superspy science fun Make your own spy sunglasses * Write messages with invisible ink * Hook up a secret alarm, and much more Discover how spies use science to keep--or uncover--top secrets.
Learn how to go under cover, master Morse code, and even builddevices to see and hear through walls These and dozens of otherfun-filled Activities give you an inside look at the science behindspy gadgets and tricks of the trade.
Sh-h-h-h-h-h Top Secret..