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Step by step illustrated instructions show children how to create projects out of everyday household items to illustrate basic scientific concepts including how sound waves work how a camera takes a picture and the secret of invisible inkStep by step illustrated instructions show children how to create projects out of everyday household items to illustrate basic scientific concepts including how sound waves work how a camera takes a picture and the secret of invisible inkStep by step illustrated instructions show children how to create projects out of everyday household items to illustrate basic scientific concepts including how sound waves work how a camera takes a picture and the secret of invisible ink