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Invisible Ink

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In this hands-on activity (on page 2 of the PDF), learners experiment with lemon juice and paper to create a message that can only be revealed using chemistry.
1 cent - $1 per student Ages 6 - 14 10 to 30 minutes

Calcium Collage

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In this activity (on pages 11-14 of PDF), learners cut out pictures from magazines of foods that help make bones strong and glue the pictures to a paper bone.
1 cent - $1 per student Ages 4 - 11 30 to 45 minutes

Bendy Bones

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In this activity (on pages 19-24 of PDF), learners soak chicken bones or eggshells in vinegar for several days.
1 cent - $1 per student Ages 8 - 14 1 to 4 weeks