As you get ready to check out at the grocery store the cashier asks, “Paper or plastic?”  Let’s add a third bag into the mix. Imagine that there were three types of shopping bags:  Paper, plastic or vinyl. All three are capable of carrying groceries.  But they do not have the same weight capacity. If I try to put the same amount of groceries in the paper bag as I do the vinyl, well, you know what will happen: Broken → Read more