As part of their research our FIRST LEGO League team studied the effect of handling food. They cut an apple in half and quickly passed one half around the circle to each of the team members (less than 10 in total). The other half was left untouched as the “control”. By the end of our meeting a difference was already quite noticeable. The half that was briefly handled was much darker in colour. The trend continued and over time the half that was handled got moldy. It’s kind of scary as it quickly showed the kids the importance of hand washing. I don’t think any of us will look at an apple again and not think of washing our hands. It’s a quick and easy experiment you can try at home with your own kids. Let me know if your results vary from ours.