Today marks the start of the 2014 FIFA World Cup. Held every four years, this highly popular international men's soccer tournament takes place in Brazil, through July 13. (Back in 2010, 3.5 BILLION people, or 46% of the world's population, watched the finals.) The host nation automatically gets a spot, and the other 31 teams qualified through a series of qualifying tournaments which started in June, 2011. A total of 64 matches will be played in 12 cities across Brazil. For the first time in World Cup finals history, electronic devices will be used to track goals. Read more about the teams and matches, and stream the games online or visit one of these venues to watch the games.