Jim and John Harbaugh have exchanged a handful of text messages, and plan to leave it at that. No phone conversations necessary while the season's still going. No time for pleasantries, even for the friendly siblings.
The Baltimore Ravens and San Francisco 49ers have thrived this season because they are physical, relentless and combative.
Jack Harbaugh has watched his sons go at it for nearly five decades.
Brady Hoke led Michigan to one of its greatest victories in a storied history that spans 132 years _ and includes a series against Notre Dame that dates to 1887.
Jim Harbaugh needs no convincing that a playoff can work in college football.
