this onion won't make me cry

Where did you get YOUR air car that self-folds up into an attache case???

Well, while most people don't own flying cars, the technology does exist. As far as the fold up part, nope. That's why the onion said "pretty much". We have everything apart from a few exceptions.

I understand, "We have the ability to do everything except for what we can't do."
I mean...I know all there is to colonize Mars, except for the stuff about rocketry and space and colonization on other places and stuff.