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yes, iodized does
Science Fair: Preserving Foods
Science Fair: Does Hot Water Freeze Faster Than Cold Water?
Science Fair: How to Stop Soda From Exploding
Science Fair: Arch Magic: The Unbreakable Egg
Do Some Colors of M Melt Faster than Others? | Education.com
Do plants need commercial food? Great for grades 5-8.
Science Fair: What Makes Ice Melt Faster?
Which cut flower lasts the longest? Great for grades K-5.
Determine how age affects the speed that someone can change the focus of their eyes between near sightedness and far sightedness. Great for most grades.
4th grade science fair ideas
Science Fair project ideas for every grade level. This science fair project investigates whether tapping the top or the side of the can will stop a vigorously-shaken can of soda from exploding.