6th grade science fair projects?

(READ THIS IMPORTANT)Ok, so I'm in 6th grade, and we HAVE to do a science fair project for the science fair. its not an option, and I've never done one before, so any ideas??? (I looked on the internet, 6th grade science fair ideas, and i clicked on 6-8th grade, and it showed 4th and 3rd grade levels. the kids at my school are pretty smart, so they all do like, 8th grade levels, well, not really, they do 6th grade, but it seems like 8th grade to me!!) soo, can you get me a few 6th-8th grade level science fair Ideas?? Thanx!! i'd really appreciate it :DDD