I was wondering if Radon Labs' location was mentioned anywhere. Did Burt say it was near his shop?

Another thing that bugs me is how do the smart ones fit in with the other special ones. Burt speculated that being a smart human made you a smart zombie. Skittles re-emphasized this when he warns against going near hospitals and 'book places' because of the brains. Therefore smartness seems to be a trait carried over from before infection.

The special ones appear to come from Ground Zero, as expressed by Kalani and C.J. But the runners, jumpers and behemoths have traits that EXCEED those of regular humans! The smart ones are just not as dumb as the other Zs. They don't have super human Khan Noonian Singh-like intelligence.