National Geographic Secret Message Science Lab
Details
Learn spy science with this unique kit. Use secret messages, decoder wheels and other science techniques to complete 5 top-secret missions. Kit includes 2 decoder wheels (1 prefilled, 1 blank), spy badge, colorless crayon, sodium bicarbonate, citric acid, 4 pieces of pH paper, 2 sponges, spray bottle and a learning guide with instructions. For ages 8 and up.