Spreading Germs

Today in the 6th Grade Science class I sprinkled the top of an iceberg head of lettuce with "germs" (actually glow in the dark powder). I then cut through the lettuce with a "dirty" knife (also sprinkled with powder). This was to demonstrate how easily the germs are spread into the lettuce and then when we eat the lettuce - into US. I may have turned the kids against salads which was NOT the point - I told them to make sure the veggies and fruits were washed well before cutting. (Of course they love the black light!). Chris