What to do for your science project for 4th grade?

SCIENCE PROJECT IDEAS # I personally did this one in 5th grade and won third place so this would be better for your stage of learning than for me: i used water, food coloring, the cun and 7 cups all of the same size.(add your own twist! do 8 colors or 3 or whatever...) pur the same amount of water in the cups. put the same amount of drops of food coloring in the water (different colors ex. first cup: 2 drops of red, second cup: 2 drops of blue etc.) basically you set them out in the sun and see if the different colors effect the evaporation of the water. purely simple. just consider it.