posted by Natalie on .
I am doing a science project about which juice cleans pennies best. I tried lemon, orange, and apple juice. I did three trials of my experiment. On average, the orange juice cleaned the pennies much better than the lemon or apple juice. My research shows that lemon juice should have been best. Do you know why this might have happened?
Yes, one would not expect that outcome. See if any of the following links can help: