Object: A dusty, smeared mirror and some window cleaner.

Good morning, boys and girls, How many of you feel that you have changed since you were born? Are you the same as you were when you were two years old? You are not the same today as you were last week, or even yesterday, are you? We are growing up, and when we grow up we change our looks. We know more, and we have different friends.

Everything changes. Look at what I brought this morning and tell me how I can change this dusty, smeared mirror. [Let them answer.] That’s right, I can clean it. But what should I clean it with? Can I use a dust rag, a broom or a hose? [Let them answe…