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I taught the Germatics lesson (it was a lesson about germs that we got to act out with puppets).
These are the BAC puppets (Bacteria's nickname, of course). They were pretty scary looking! Before the students came in I sprinkled some Glo Germ into each puppet and after reading a books about germs (we read Germs, Germs, Germs!) I had several students come and put the puppets on their hands as we acted out a story found in the lesson.
When we were done reading the play the students pulled their hands out of the puppets and I told them that they now had fake germs on their hands. Then I held the black light over their hands and the "germs" glowed white. Just so no one was left out, I then had each student go around and give hive fives or shake hands with the other kids so that they could all see their hands glow.
I hope you can find a lesson that inspires your inner mad scientist!