Today's useless fact - Why haven't flying cars been invented yet?

Flying cars have been invented and built. Several working prototypes of various configurations have been built and flown - at least one first flew several decades ago (with removable, storable wings), so it is not even a new thing.

They are not mass-marketed for a variety of reasons including safety, cost, regulation and infrastructure. Too many drivers cannot safely navigate in two dimensions; three would make for a disaster. Check out the links in our Flying Car category for more.