While the Pentagon struggles to deploy a huge antimissile system against a presumed threat from North Korean rockets, biologists are working to develop tiny "antimicrobial" defenses against harmful germs, including from biological weapons.
For the first time, and with Bush administration support, NASA intends to develop a nuclear-powered spaceship. But some oppose the plan over fears of a nuclear accident.
A report on the efforts of researchers around the world to create effective multi-robot teams to accomplish large, complex tasks.