http://assets.espn.go.com/i/tvlistings/tv_espn_original.gif en-us 10 ESPN Inc. http://espn.go.com/ Copyright 2010 ESPN Inc. ImPACT sells tests and training to pro teams, colleges, high schools and sports medicine centers, but some question whether the program actually works.]]> August 23, 2012 13:08:42 PDT When the NFL reversed field on concussions, it spawned a medical gold rush that pits scientist against scientist in a quest for cures, treatments and dead men's brains.]]> December 30, 2010 05:24:48 PST We've ranked 92 teams from baseball, football and basketball.]]> February 16, 2005 03:58:12 PST We've ranked 92 teams from baseball, football and basketball]]> January 20, 2003 06:23:41 PST