What is a good science fair idea
Test how different people react when you play a sine frequency to them. See if you can help someone learn faster, or test their heart beats or something.
Try going to www.sciencebuddies.com... An amazing way to get ideas!
what soda and juice do to your teeth. like put eggs in different things and depending on which one is dyed more thats the one that has the most sugar
A solar panel over i made one for a class and it was fun