 It may be the middle of summer, but back-to-school shopping is in full swing. At Kohl's, Levi's jeans and jackets are 40% off, while Gap is slashing prices up to 50% on back-to-school styles. And if you can wait, experts say you may find even bigger discounts over Labor Day weekend. NASA scientists say they have discovered something on Mars they couldn't have guessed would be there. WTOP's Michael Toscano explains.