Science Buddies: "Ask an Expert"

Hi everyone,

I am doing a science fair that is coming up soon. To make a long story short, I have to do something that has to do with McDonalds or fast food. Everything that I found is about decompostion. Does anyone have ideas that are original and around 7-9th grade level? Any help is appreciated!!

This one seems like it might be a good match for you: https://www.sciencebuddies.org/science- ... p049.shtml