Glad you made it! But how many tries did it take you to get here? One? Five? Sixteen? If you found it on the first try, you are either very good or very lucky; most people don't usually choose the correct one until they've guessed three or four fakes. Why? We see pennies nearly every day, yet we don't remember their details. If you have a bunch of change in your pockets, take it out and look at it. Is there a penny among the coins? How can you be sure? A cursory glance will give you a rough idea of how much you've got, but how do you distinguish them? Well, a dime is the smallest and thinnest, the quarter is quite a bit larger than any of the common coins, the nickel is really thick, and the penny is a different color. Human minds are lazy, and we usually remember the details that we need and disregard anything else. Therefore, because the details of things like pennies seem useless and inapplicable to our daily lives, we fail to notice what direction President Lincoln faces or the location of the date, screening them out before they hit the short-term memory. And, in the rare cases when the information might get there, we soon forget it because we have no reason to perform the elaborative rehearsal needed to commit the data into the long-term memory.