Sea Spies?

• Position: MILITARY - Defense Advanced Research Projects Agency's research on marine animals

The U.S. government is developing a new way to keep tabs on enemy submarines. It doesn't involve flashy technology; instead, officials hope to rely on aquatic creatures to alert them to potential danger. The military's research arm, the Defense Advanced Research Projects Agency (DARPA), recently began studying how marine animals react to changes in the water. Goliath grouper fish, for example, make a booming sound when divers swim by, while some micro-organisms light up in response to touch and movement. If scientists could...