March Madness is upon us once again. This year's NCAA Division I Men's Basketball Tournament welcomes five teams making their first-time appearance, including Northwestern University and the University of California, Davis.
Villanova University, the defending national champions, earned the overall No. 1 seed. Experienced teams like the University of North Carolina, the University of Kansas and the University of Arizona made it back to the Big Dance, but there's no telling what could happen in a field where the top-ranked team from the regular season changed several times.