Object: A vacuum sweeper.

Good morning, boys and girls. How many of you like to live in a clean house? Most of you like a clean house. How does your mother get the house clean when it gets dirty and cluttered? What does she do? [Let them answer.] That sounds like a lot of hard work. What kind of things does she use to help her clean? [Let them name some.] That is very good. I brought one of the things that you mentioned with me this morning. [Bring out the sweeper.] How many of you ever get to use the sweeper when your mother cleans? Some of you do.

A sweeper is pretty important, and it is not as simple as it looks. This sweeper happens to be named Sally, and Sally Sweeper is made up of a lot of parts. Let's take Sally apart and see wha…