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Supporting Structures

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In this activity about living things and gravity (page 5 of PDF), learners design and build an exoskeleton or an endoskeleton for an animal of their own invention.
1 cent - $1 per group Ages 6 - 11 1 to 2 hours

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