A little boy returning home from his first day at school said to his mother, "Mom, what's sex?"

His mother, who believed in all the most modern educational theories, gave him a detailed¹ explanation, covering all aspects of the tricky² subject.

When she had finished, the little lad produced an enrollment³ form which he had brought home from school and said, "Yes, but how am I going to get all that into this one little square?"