What's bugging Nurse Penny?

When Nurse Penny loses her smile, three of her young patients provide encouragement, which leads to an impromptu school assembly at which Nurse Penny educates students about head lice, with which she, herself, is afflicted. When Nurse Penny loses her smile, three of her young patients provide encouragement, which leads to an impromptu school assembly at which Nurse Penny educates students about head lice.