Exploring science
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26)
Volcanoes & earthquakes: an amazing fact file and hands-on project book : with 19 easy-to-do experiments and 280 exciting pictures
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28)
What is flight?: birds, planes, kites, balloons; with 18 easy-to-do experiments and 240 exciting pictures
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31)
Machines: gears, levers, pulleys, engines : with 20 easy-to-do experiments and 300 exciting pictures
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