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• DNA robot targets cancer cells
  
Researchers show off a "robot" made of DNA molecules that can target cancer cells and release a payload of antibodies upon finding them.
• Models underestimate future temperature variability Food security at risk
  
Climate warming caused by greenhouse gases is very likely to increase summer temperature variability around the world by the end of this century, new research shows. The findings have major ...
• Why a tightened defense budget would improve national security
  
National security officials and experts say that if the defense budget were tightened policymakers would be forced to better prioritize spending.
• Facebook again taken to task on user security
  
Facebook today was reprimanded by a coalition of ten privacy groups, which urged the popular social-networking site to close several outstanding security loopholes. For Facebook, it's déjà vu all over ...
• iPhone 4 preorder date pushed back after reports of security breach at AT and T
  
iPhone 4 preorders are no longer accepted by AT&T. The Apple Store is still accepting iPhone 4 preorder requests, but the ship date is now July 2. ...
• Studying cells in 3 D could reveal new cancer targets
  
Showing movies in 3-D has produced a box-office bonanza in recent months. Could viewing cell behavior in three dimensions lead to important advances in cancer research? A new study indicates ...
• More changes to airline security after Christmas Day incident
  
The changes focus on stepped-up intelligence sharing. They also attempt to address concerns that arose after new airline security measures were put in place in January.
• Transit security up worldwide after Moscow subway bombing
  
Transit systems across Europe and the US increased security Monday following the Moscow subway bombing that killed nearly 40. But experts say long-term measures are what's needed. ...
• Moscow Metro bombings Insecurity in Chechnya N. Caucasus comes to Moscow
  
Officials blamed today's twin Moscow Metro bombings, which struck near the FSB security service and a major state-run media outlet, on two female suicide bombers from the N. Caucasus. ...
• Sarah Palins gun imagery takes aim at political targets
  
Caught in Sarah Palin's rifle sights, liberals warn of the threat of violent rhetoric. Will it marginalize passionate discourse, or will demonizing hot-headed conservatives backfire at the voting booth? ...