Fri, May 24, 2013, 12:27 PM EDT - U.S. Markets close in 3 hrs 33 mins
A change in outlook or perception about the furture does most of it, then combined with short covering is what does it
Sentiment: Buy
Overall market is also strong or it can ziz zap but not in a straight line.
Just adds fuel to the fire. Going from a bon-fire to a forest fire.