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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
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In this demonstration about momentum, use physics to distinguish between a hard-boiled egg and a raw egg without cracking them open.

1 cent - $1 per group Ages 4 - adult Under 5 minutes