Help with science fair!?

I'm in 8th grade right now and I recently competed in the science fair. I did fairly well (3rd place in state for microbiology) but for 9th when I'm allowed to compete in ISEF I need a really good idea to base my experiment on. This year I tested how antibiotics affect bacterial growth and I'd like to... show more I'm in 8th grade right now and I recently competed in the science fair. I did fairly well (3rd place in state for microbiology) but for 9th when I'm allowed to compete in ISEF I need a really good idea to base my experiment on. This year I tested how antibiotics affect bacterial growth and I'd like to test something similar to this. Please help!
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