I fall down
Simple experiments introduce the basic concept of gravity and its relationship to weight.
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| Main Author: | |
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| Other Authors: | |
| Format: | Books Print Book |
| Language: | English |
| Published: |
[New York] :
HarperCollins,
c2004.
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| Edition: | 1st ed. |
| Series: | Science play
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| Subjects: | |
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