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mjgds: Middle School science lesson
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mjgds: IMG_4990
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mjgds: IMG_4989
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mjgds: IMG_4988
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mjgds: IMG_4987
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mjgds: IMG_4985
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mjgds: IMG_4982
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mjgds: IMG_4981
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mjgds: IMG_4979
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mjgds: IMG_4977
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mjgds: IMG_4975
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mjgds: IMG_4974
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mjgds: IMG_4973
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mjgds: IMG_4971