  Computers in your bloodstream? The next thing you know they will be communicating with each other and . . . well, did you read Prey ? From another Wired News story : urlLink Tiny Computer Could Fight Cancer "We've taken our earlier molecular computer and augmented it with an input and output module. Together the computer can diagnose a disease and in response produce a drug for the disease in a test tube," Shapiro told Reuters. The microscopic computer is so minuscule a trillion could fit in a drop of water. Its input, output and software are made up of DNA molecules -- which store and process encoded information about living organisms. 
