Mega Millions, Powerball jackpots at cusp of combined $1 billion

DES MOINES, Iowa -- Did someone say $1 billion in jackpots?The combined Mega Millions and Powerball jackpots for drawings Tuesday and Wednesday nights total $999.The fourth-biggest grand prize in U.S. lottery history will be on the line Tuesdaynight when the numbers are drawn for the Mega Millions game's estimated $654 million jackpot. It's the second-largest in Mega Millions history.It got that enormous because no one's won the jackpot since July 24, when a group of 11 co-workers in Santa Clara