What all happened in the race today?

Denny's tire issue , losing a valve stem on the outer tire sent him back late in the race(probably rubbed another car to cause this), and Carl Edwards had lost a valve in the engine. This nearly meant engine failure. Except the team overcame that trouble by taking the engine apart to get the valve head out of the cylinder and getting the car back out on track to gain points. Years ago you would have seen this as a DNF, but with the new rules it was a great call to save as many points as possible. No one last year or before would have ripped apart the engine to accomplish say... 5-10 points. They would have taken the DNF. New system makes them be more aggressive to getting back on the track if they have problems. Which doesn't usually give the fans anything to scream about, but it makes the points race tighten up that much more with all the pressure involved. This will, in time, make fans scream for their favorite driver to "get out there" instead of the DNF.