HI! This is not a strong area for me so, I am wondering if any of you have some good science fair ideas for little ones. K & 1st grade. They are not obligated to do one at this age level, but they really want to. The two ideas I have are ... What container insulates ice the best? and What surface does a toy car move on better? Carpet or tile? So, this is what we have. The kids seem to like them but just curious if any one has some other suggestions. They would be greatly appreciated!