You might wonder what kinds of science projects grade school kids do. The projects were all supposed to test a hypothesis with some kind of experiment. The students then were to write up the results in a paper and present it with a poster. Examples of the sorts of questions they were asking were:
What cleaners remove stains best?A lot of the ideas came from the Internet.
Do crickets chirp more when they are warm or when they are cold?
How do various liquids degrade egg shells (which are similar to teeth)?
Will mud bricks be stronger if sand, gravel, or hay is added?
How does adrenalin affect the heart rate of water fleas?
What brand of paper towels is more absorbent?
What disinfectant kills bacteria best?
Does matte nail polish last longer than glossy?
What foods mold most quickly?
few years ago.)