One day, the teacher walks into her classroom and announces to the class that on each Friday, she will ask a question to the class and anyone who answers correctly doesn't have to go to school the following Monday. On the first Friday, the teacher asks, “How many grains of sand are in the beach?” Needless to say, no one could answer. The following Friday, the teacher asks the class, “How many stars are in the sky?” and again no one could answer. Frustrated, little Johnny decides that the...