It simply does not exist yet. There were no good airplanes before Orville and Wilbur showed up on the scene. I hope there will be some breakthroughs soon, but s

It simply does not exist yet. There were no good airplanes before Orville and Wilbur showed up on the scene. I hope there will be some breakthroughs soon, but scientific discoveries can't be planned/scheduled, so who knows how long it'll be... SHRDLU is nothing more than a really well-done ELIZA for a really small domain.