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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

Good Stress

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In this activity about physical stress (page 28 of PDF), learners discover that muscles and bones need to work to stay strong.
$1 - $5 per group Ages 6 - 11 1 to 4 weeks