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mmuyskens20: IMG_2018
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mmuyskens20: IMG_2019
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mmuyskens20: helium soap bubbles
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mmuyskens20: narra fluorescence - Calvin College
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mmuyskens20: IMG_2026
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mmuyskens20: making helium soap bubbles
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mmuyskens20: LASER demo - Calvin College
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mmuyskens20: IMG_2030
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mmuyskens20: tetrahedron hands-on activity - Calvin College