Why are Homes and Autos Still Built the Old Fashioned Way?

We could build homes that stand up to hurricanes, earthquakes, floods, and other disasters. We could build cars that are lighter and more fuel-efficient. Like the opening for the old TV show, "The Six Million Dollar Man," we have the technology. So why don't we use it? The reason is that people who build homes, cars, and other things would need to be retrained -- but the result would be a more sustainable and safer world.