Today I learned something from someone unexpected. I discovered that if you own a string of pearls, they are strung with a knot in between each pearl. This is done for two reasons. First, if the pearls are allowed to rub against each other over a long period of time they will begin to wear down. Second, if your necklace should break, all the pearls will not slide off. The string will just break but you don't risk losing a pearl.