The mental and physical wherewithal required to compete at NASCAR's national level can be impossible to deduce from the outside looking in. Those are the snapshots that best encapsulate NASCAR, those heart-in-your-throat moments when there seems no way a driver can pull off the impossible -- yet somehow, he does. Through all the months and weeks and laps of competition, it's those individual moves on the race track that so often stand out, and the 2013 season certainly had its share. Tony Stewart and Brad Keselowski discovered as much during the June event at Pocono Raceway, when the last two champions of NASCAR's premier division at the time made slight contact driving through Turn 2. More...