littlesparkvt tips news that the Curiosity Mars rover began driving today at Bradbury Landing in Gale Crater. The rover rolled forward about 4.5 meters, then stopped, rotated 120 degrees, and rolled another 2.5 meters. The article has a picture of the rover's tracks in the Martian dust, and you can browse the image gallery or raw image feed for more. Matt Heverly, the rover's lead driver, confirmed that the mobility system is functioning perfectly in the lead-up to its first major land trek. "Curiosity will spend several more days of working beside Bradbury Landing, performing instrument checks and studying the surroundings, before embarking toward its first driving destination approximately 1,300 feet (400 meters) to the east-southeast." Reader redletterdave adds news that NASA has released an enhanced video of Curiosity's descent from space, which is pretty cool to watch. There was also some minor bad news yesterday; one of the wind speed sensors on the REMS weather instruments was permanently damaged during landing. Emily Lakdawalla explains,"The reason there were two is that it helped triangulate wind speed and also improve accuracy of wind speed measurements when one of the booms is aimed windward or leeward. So the quality of the wind speed data will be harmed, but there will still be wind speed data."

Hugh Pickens writes "As you weave through interstate traffic, you're unlikely to notice a plain-looking Peterbilt tractor-trailer or have any idea that inside the cab an armed federal agent operates a host of electronic countermeasures to keep outsiders from accessing his heavily armored cargo: a nuclear warhead. Adam Weinstein writes that the Office of Secure Transportation (OST) employs nearly 600 couriers to move bombs, weapon components, radioactive metals for research, and fuel for Navy ships and submarines between a variety of labs, reactors and military bases. Hiding nukes in plain sight and rolling them through major metropolitan centers raises a slew of security and environmental concerns, from theft to terrorist attack to radioactive spills. 'Any time you put nuclear weapons and materials on the highway, you create security risks,' says Tom Clements, a nuclear security watchdog for Friends of the Earth. For security, cabs are fitted with custom composite armor and lightweight armored glass, a redundant communications system that links the convoys to a monitoring center in Albuquerque, and the driver has the ability to disable the truck so it can't be moved or opened. The OST hires military veterans, particularly ex-special-operations forces (PDF), who are trained in close-quarters battle, tactical shooting, physical fitness, and shifting smoothly through the gears of a tractor-trailer. But accidents happen. In 1996, a driver flipped his trailer on a two-lane Nebraska hill road after a freak ice storm, sending authorities scrambling to secure its payload of two nuclear bombs; and in 2003, two trucks operated by private contractors had rollover accidents in Montana and Tennessee while hauling uranium hexafluoride, a compound used to enrich reactor and bomb fuel."