Teaching children to love science can be difficult. Getting kids to wash their hands can be even more so. Well, Tennessee-based teacher Courtney Lee Simpson has managed to do both for her class in one foul, really gross swoop.

In a post that's gone viral on Facebook, Simpson showed off a neat experiment she did with her class to teach them about the importance of washing their hands.

"To all my teacher friends this is the grossest yet coolest experiment," she wrote. "I did this while teaching about germs and how they spread. You use three pieces of bread. You let all the kids see you put a piece of bread in a baggy with a glove on hence 'controlled' then you wash your hands and put a piece of bread in a baggy for 'clean' last but definitely not least you pass a piece of bread around and let every kid in class touch it then you put it in a baggy and label it dirty."

"Watch how the bread changes over time due to germs. It is so cool and a great way to teach the importance of hand washing".

And boy does the bread change.

Eventually, it lived up to its classification—and then some—by turning green and moldy. (The other slices fared much better.) “Hands on activities and visuals are very important to use with that age,” Simpson said. “That is how they learn.”

While a memorable science experiment for kids, now hundreds of thousands of adults in the world can picture it every time they need to wash their hands.

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