Yes, I know that I usually give homework questions at the end of a post. Let me go ahead and assign these now - just in case you think the physics links aren't that useful. Suppose you have three ...

PITTSBURGH (KDKA) -- While the credit cards are waxed and ready to slide, the looming deals of Black Friday have become a bit confusing. With Thanksgiving Day, online, doorbusters and early openings, ...