Science fair! Science fair! Science fair!?

What are some good science fair ideas? (preferably on the 9th grade/high school level) They can't be a demonstration and absolutely no volcanoes, lol Thanks for your help! =] ***they must be experiments that prove/disprove a hypothesis. ****also please include some of your science fair experiments you... show more What are some good science fair ideas? (preferably on the 9th grade/high school level)

They can't be a demonstration and absolutely no volcanoes, lol

Thanks for your help! =]

***they must be experiments that prove/disprove a hypothesis.
****also please include some of your science fair experiments you have done in the past, too, if possible
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