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Titan, potentially the world's fastest computer, comes online at the Department of Energy's Oak Ridge National Laboratory. The supercomputer is designed to do more than 20,000 trillion calculations a second, allowing researchers to model everything from black holes to nuclear reactors. And they'll have video gamers to thank for its blazing speed.

Sandy hit the East Coast on Monday and knocked out power for millions of people. Utility companies face major challenges to get power back online after the massive storm.

Robert Siegel talks with Associated Press correspondent Katie Zezima, who was in Atlantic City, N.J., close to where Sandy made landfall.

Weekend Edition host Scott Simon talks with Eliot Higgins, known as the Brown Moses blogger, about the range of arms used by Syrian rebels. Brown Moses is considered an authoritative source on arms used in the Syrian conflict.

The National Weather Service is tracking where the superstorm Sandy goes next. Jennifer McNatt, of the National Oceanic and Atmospheric Administration's national operations center, speaks with Steve Inskeep about what people should expect.

In California, John Sach grew a pumpkin weighing just under 1,000 pounds. He calls it "Sally," and it won Orange County's annual Pumpkinmania contest. Sach's pumpkin outgrew the runner-up, "Gourdita," which was downright skinny at 795 pounds.

Kurt Vonnegut aspired to be a sort of "cultivated eccentric." Reviewer Drew Toal says a new collection of Vonnegut's letters — by turns hilarious, heartbreaking and mundane — reveals just how uneccentric the writer actually was.

Steve Inskeep talks with Maryland Governor Martin O'Malley about Hurricane Sandy and how it's affecting his state.

U.S. officials warn Hurricane Sandy may affect as many as 60 million Americans, with heavy rain, high winds, and dangerous flooding. Thousands of flights have been canceled, schools are closed and public transit systems in New York and Washington have been shut down.

Election Day is a week away and it seems everywhere you look, there's a new poll on TV, online, or the radio. But they don't all say the same thing. Host Michel Martin looks at why the polls vary, and what they tell us. She talks with Stanford University political science professor Simon Jackman.