Pull out your wallet. Before you hand over that bill for coffee, flip it over. Look at the serial number, the seal color, and whether there's a tiny star at the end of the number string. Most of what ...

Pull any bill out of your wallet. See the dark green numbers on the top-left and top-right corners? Those are serial numbers, and some are more rare than others. If you happen to have paper money with ...

Have you ever wished you could stretch a $1 bill beyond its face value? That dollar in your wallet might be worth a lot more than you think, so consider holding on to it instead of spending it – at ...