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Jumpy Dolls
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In this activity, learners are challenged to design and construct a jointed figure that moves in a motion (something like jumping jacks) when a string is pulled.
Strong Bones, Weak Bones
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Most people will break a bone in their body at some point in their life, but how much force does it take to break one?
No bones about it!
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This is an activity (located on page 3 of the PDF) about the mixture of materials in bone and how they affect its strength.