The students at Wilder Elementary in Littleton, Colorado proved that Mom is right, “Wash your hands with soap and warm water!”? The third grade class did an experiment using Petri dishes prepared with agar (a seaweed derivative). Agar is an ideal “food”? source for the bacteria. The students collected samples around the school including on top of the tissue box, door knobs and more. You won’t believe what they found growing in the common areas that we all touch. They also tested how well common cleaners eliminated the bacteria.

The students also learned how to properly handle the growing bacteria. Always seal the Petri dishes and throw them away when you are done. The teachers had the students take pictures of the dishes, so they could refer back to their findings, without having to store bacteria that can make them sick.

Watch the Video to see what they found

Read more about how to do your own experiment with nutrient agar.