This idea uses new RFID technology. first a line would be painted on your yard via supplied instructions. Then using a gun-like applicatior a RFID would be shot into the ground, following your line at 2 ft intervales. The nice thing about RFID is they are all numbered different. so you can program a robotic lawnmower fitted with a RFID sensor to follow the sequence of numbers. This has both commercial and residental applications.
Reward: A firm handshake, freebe system and product development involvement. A dissucsion of possible licensing.