For a closer look at the exotic aircraft the Air Force might be cooking up at Area 51, launch the photo gallery.

The future of secure travel hinges on seamless, instant communication¿and 24/7 autonomous surveillance. Smart sensors will wirelessly monitor the engines of tomorrow s buses for signs of tampering. Toxin detectors will sniff future trains and subways for airborne toxins, then alert the authorities long before passengers do. Radio transponders will constantly track the whereabouts of luggage, keeping it out of nefarious hands. In-flight cabin cams will transmit real-time images of the shady guy in row 13G to ground control.