6 Amazing Technologies That Are Illegal in the US

[sethnintendo]

ECM said:

 (Pro-tip: cars aren't lighter and not made of steel because it would *kill* people in accidents, therefore making cars super fuel efficient is impossible on *physics*--it's not a lack of will, but a lack of a death wish that prevents this from happening.)

I don't understand your argument here.  What are you trying to say negatively about the article in the car section?  You know carbon fiber is stronger than steel while being lighter?  Sure it might cost more but I don't really get what you are trying to state?  We could make the cars out of wood pulp extract which is apparently are stronger than steel and carbon fiber.