Soccer—or football—is the most popular sport in the world. But beyond throwing on a jersey and cheering for your team, soccer fans have another way of showing their love. Where baseball has its cards, World Cup soccer has its stickers. For nearly 50 years, the Panini sticker album has become a well-worn, global ritual, where fans collect, trade and try to fill up their tome with as many players as possible. It all began during Mexico’s World Cup in 1970; today, it’s become a tradition nearly as treasured as watching the games themselves.