2 Ergebnisse.

Sh-h-h-h-h-h!! Top Secret... 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 build devices to see and hear through walls! These and dozens of other fun-filled activities give you an inside look at the science behind spy gadgets and...

Dig into the science of ancient times and unearth amazing discoveries! Have you ever wondered where paper comes from, who made the first known maps, or how the ancient Egyptians were able to build the pyramids? Would you like to make your own sundial, discover how to detect earthquakes, or learn to write in hieroglyphics? Are you looking for great ideas for your next science fair project? If you answered ' Yes' to any of these questions, then ...