Auburn University - Truman Pierce Institute

STEM Newsletter
How clean are your hands?

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Want to know just how clean your hands and surfaces are? A lot of experiments require some kind of agar-filled Petri dish, but for this one, you'll just need a loaf of bread! 

Click the image above for a simple experiment that can demonstrate the importance of hand washing and surface cleaning. While the instructions dictate to have a control slice plus a slice touched with clean hands and one touched with dirty hands, you can easily use a gloved hand to rub the bread on different surfaces in a classroom as well (or even phones and laptops!). 

This experiment may take a few days to show results, but real-world science is never as fast as we think it is or want it to be--an important fact for youth to understand. Always have youth write down predictions and/or hypotheses before starting an experiment. After initially setting up the activity, youth can monitor it daily by taking pictures of the bread over time, writing down observations, or drawing what they see. 
Georgeann Hester 
Questions? Comments? Let me know!

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Truman Pierce Institute · 889 Harvard Dr · Auburn, AL 36830-3386 · USA

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