Really really good science fair project ideas?

I'm in middle school, but I need a REALLY hard science fair project, because I really want to test myself, and nothing seems hard enough. I want something that's interesting and really amazing too, like last year I did an experiment on 'Which Fruit Will Generate the Most Electricity?', and the... show more I'm in middle school, but I need a REALLY hard science fair project, because I really want to test myself, and nothing seems hard enough. I want something that's interesting and really amazing too, like last year I did an experiment on 'Which Fruit Will Generate the Most Electricity?', and the result was a tomato. And I need something soon because science fair is coming up. We can't have anything that involves humans or animals. And something that I could display would be good, too.
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