This is the question Grace chose to ask for her science fair. Yes, those are colored on painted nails. What can I say, I'm raising girls. :) Since it is so relevant to keeping us healthy, lots of people have been interested in her results so I thought I'd share what our little scientist studied incase you want to replicate it in your own academic setting. To do the project we ordered petri dishes with pre-poured agar off Amazon. One dish was opened to air for 10 seconds and immediately…