Soccer is, without a doubt, the world's most popular sport. Football is, without a doubt, America's most popular. Football absolutely dominates in the U.S., but once you leave North America and nobody cares about Brady vs. Manning, or Auburn vs. Alabama. Messi vs. Ronaldo? That's more like it. The new year dawns, like always, with a zillion college bowl games and the NFL playoffs, and the over-saturation of football has us puzzled as to why its popularity so outstrips soccer's in this country. Football's flaws, some unredeemable, are there for all to see: serious injuries, drawn-out replay reviews to interpret...