- Talcum powder
First, tell the students that germs and viruses cannot be seen with the naked eye, but that they can affect us by causing sickness. Tell them that you will give them a visual understanding of what germs might look like when we sneeze using talcum powder.
Pour some talcum powder into your hand and pretend to sneeze, not covering your mouth or nose. Due to the element of surprise, this will get a rise out of the class because obviously the talcum powder will fly all over the place. Tell them that this is similar to the way "invisible" germs are spread through the air. Once the class has settled back down, tell the students to watch as the talcum powder "spreads" and repeat.
Next, repeat the procedure, only cover your mouth with the inside of your elbow or a tissue and note the difference. (Note - You will want to choose your outfit carefully that day.) Next, if the talcum powder represents germs, then put a little bit more in your hand, and turn to shake hands with a student and pick up a classroom object. Ask the students what might be occurring as you do this.
Last, you should have some residual talcum powder remaining on your hand. Ask the students how you should get rid of it. Ask them if you should wipe it on your pants or shirt? (This is a gross reminder, but it is what kids do!)
Model to the students proper hand washing, using warm water and soap. Teach students to hum a familiar tune, such as "The Happy Birthday Song" to themselves as they wash their hands, which will help them wash for an adequate amount of time.
In summary, ask the students to think of reasons why Miss Bindergarten's Kindergarten class might have gotten sick.
Have the student's journal what they have learned in a science notebook.