They have! It's just hidden in your everyday world. The incredible engines we have now, the robotics, self opening car doors, surgical robots, those heart va

They have! It's just hidden in your everyday world. The incredible engines we have now, the robotics, self opening car doors, surgical robots, those heart valves that they can implant through an artery in your groin and expand in your heart, surgical navigation and spine/brain surgery, space travel....