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ht_vogel: Materials (IMG_5497)
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ht_vogel: Water Displacement test (IMG_5479)
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ht_vogel: pushing balloon under water (IMG_5478)
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ht_vogel: Experiment #1 (IMG_5472)
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ht_vogel: Experiment #2 (IMG_5490)
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ht_vogel: Experiment #3 (IMG_5496)
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ht_vogel: IMG_5533
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ht_vogel: IMG_5540
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ht_vogel: IMG_5546
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ht_vogel: IMG_5548