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Bone Stress
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In this optics activity, learners examine how polarized light can reveal stress patterns in clear plastic.
Colored Shadows
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In this optics activity, learners discover that not all shadows are black. Learners explore human color perception by using colored lights to make additive color mixtures.
Natural Selection Because of Different Color: Camouflage
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In this activity (p.5-6 of PDF), learners investigate natural selection. Learners discover that natural selection, which takes place over decades, can lead to altered populations within a species.