Darpa stories

DARPA and Dallas's Southern Methodist University have teamed up to build a better retinal scanner. Ideally you'd want someone standing still, looking straight forward, and scan the full eye. Now? DARPA and SMU claim they could possibly scan all the eyes in an unaware crowd.
Rocket-propelled grenades, probably best known for their supporting roles in various Michael Bay movies, are a real and ever-present danger to armored vehicles in Iraq and Afghanistan. It's a tough problem: How do you stop an explosive that's about to...