Why heat, travel and sleep could challenge teams as much as the opposition at the World Cup

By Emile Nuh, CNN (CNN) — With the World Cup kicking off on June 11, anticipation is building for what will be the biggest tournament in the competition’s history. A record 48 teams will compete across 104 matches in the United States, Canada and Mexico. Heavyweights such as France, Spain, England, and Argentina are among