If your car gets stolen an on-board system will immediately begin releasing a uniquely scented dribble from a hidden tank on it's underside. This can then be traced using a techno nose [link] mounted on the front of a robotic, self steering vehicle. The techno nose (protected from the elements by a large, rubber, nose-shaped hood and assisted in it's job by two fans sucking scent into the nostril shaped inlets) will be connected to the steering system of the robot. As the scent weakens and strengthens the techno nose wanders about following the strongest trace, and so sniffs out your car.-- Mony a Mickle, Nov 18 2008 Techno nose http://science.nasa...004/06oct_enose.htmWhy isn't it nose-shaped? [Mony a Mickle, Nov 18 2008] Sort of like SmartWater .... smart Eau-De-Cologne ? [+]-- 8th of 7, Nov 18 2008 good idea. what about - stinky cars. just make the car smell, such that anybody walking past will realise. it then gets reported.-- williamsmatt, Nov 19 2008 Will, would you like to get back in your stolen but recovered car if it stinks to high heaven?-- neelandan, Nov 19 2008 random, halfbakery