When Mary Smith was a student, she always wanted to become a teacher, because she liked children. When she was twenty-one years old, she began teaching in a small school. She was a good teacher, and she laughed a lot with the children in her class. They enjoyed her teaching.
One day one of the girls in her class said to her, "Miss Smith, why does a man's hair become gray before his mustache and beard do?"
Mary laughed and answered, "I don't know, Helen. Why does it become gray before his mustache and beard do?"
"I don't know either, Miss Smith," answered Helen, but it happened to my father." The other children in the class laughed when they heard this.
Then one boy said, "I know, Miss Smith! Men's hair becomes gray first because it is sixteen years older than their mustaches and beards."
