You grab a basket and walk through the sliding glass doors of the grocery store. As you enter, you realize that you can't remember what you came to the store for. You know you need the basic groceries, such as bread and eggs, but there's also one other item that you can't recall. Not being able to remember that, of course, is frustrating. Instead of quickly picking up your groceries and going back home, you now have to walk down the isles until you...