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Science Fair projects should be creative, fun and informative. Here's a list (with pictures) of some of the best science fair projects ever. If anyone knows what. Over 400 of the best, most fun, easiest and coolest science projects for grades K- 12! All projects include complete instructions. Print it & start it now! Science Fair Ideas. Okay, here is the hardest part of the whole. Hundreds of detailed science fair project ideas for all grade levels in a wide range of.