I apologize in advance about this question, but I'm not that technically inclined. In looking at the new macbook pros, I noticed that the 13 inch macbook pros have faster GHz, then the 15 inch macbook pros. I recognize that the 13 inch have dual core, and the 15 inch have quad cores, but I thought that the GHz speed was an objective figure. So basically, can someone explain to a liberal arts major how the quad core with a slower GHz figure run faster than a dual core. I know this question may seem dumb, but I really am technically challenged, but I would like understand this. Thanks.