Need help with 7th Grade Science Fair Project

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My daughter has to select a science fair project this weekend. Any suggestions or good websites would be appreciated. I know that several of you are engineers and rocket scientists so try to keep it to something that an accountant can deal with. There is no limitation other than she do the project and be able to explain how the project/experiment works.

I thought about the Bobby Brady volcano, but it seems the teacher vetoed that idea.