Read this list of 200 science-fair project ideas. Circle all ...

Do different brands of batteries last longer than others? 109. Which uses more water: a shower or a bath? 110. Which type of cup will keep a hot drink warm longer: paper, plastic, Styrofoam, or glass? 111. Do natural mosquito repellants keep more mosquitoes away than artificial repellants? 112. How do gas stations affect the soil around them? 113. ................
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