Introduction Figure [1] picture of how many bags are used by an average grocery store purchase Imagine the following situation: It’s a Sunday afternoon in your suburban Pennsylvania town, and you’re doing a weekly reset before a busy week. Naturally, you buy a week’s groceries at the local grocery store. When you arrive home you realize you have forgotten eggs. Because it’s only a five-minute drive away, you quickly go and buy enough eggs to last the week. At the checkout, the cashier...
