Science experiments for children – The Importance of hand washing. Take two clean glass jars with lids and two slices of apple well washed.
Put the first slice, clean, in the first jar and close, labeling it most prefer, so that it is always recognizable on the other.
Pass the second slice several times in the hands of children and teachers, before storing it in the second jar.
Close this jar too, and wait.
This is an example of what we can observe after one week.
photo credit: http://www.growinginprek.com/
We can also do the same experiment using different foods from apple:
Science experiments for children – The importance of hand washing