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With the National Geographic: Secret Message Science Lab, kids will gain insight into pH science and learn fascinating facts about spy history.

• Two Decoder Wheels – Kids will get 3 decoder wheel missions, deciphering messages with a prefilled decoder wheel and creating their own decoder wheel/secret code language.

• Reveal a Secret Message – Using pH paper and a citric acid solution, kids will be able to reveal a secret message they’ve written with a colourless crayon.

• Hide a Secret Message – Using pH paper and a sodium bicarbonate solution, kids will be able to hide the secret message they’ve written with a colourless crayon.

Ages: 8+ years