Ania-

I hope your kids do well. We enjoy the annual science fair here, but it is non-competitive and the homeschoolers who participate range from three year olds putting out their dinosaur collection to teens who have sheep's brains and other body parts on display with elaborate hypotheses. It's really cool that each child can do their own thing and make it as complex or as basic as they like.

Last year, my school age kids did a fish breeding experiment. The first batch of breeders died though, and the replacements didn't give birth before the fair! We had a big question mark on the board where the results were supposed to go!