According to the Psychonomic Bulletin and Review, 39 in 40 humans
TECHNICALLY YOU ARE 1 IN 40 NOW
Natural multi-taskers were discovered during the course of another study, which attempted to determine whether driving while distracted was dangerous.
After claiming their Master of the Obvious awards, the scientists realized that the driving abilities of approximately 1 in 40 test subjects remained constant (or improved!) while distracted by solving math problems or talking on phones.
These special 1 in 40 have been dubbed "supertaskers" by the scientists involved, who obviously hope to diminish their innate awesomeness by saddling them with a crap codename.
WE ALL KNOW HOW THIS WILL END
The "supertasker" study's author, Jason Watson, warns humanity to not use this as an excuse to talk, eat tacos, apply nail polish, and brush hair while it drives. Still, I know a lot of people named Jason, and I'm not impressed.
I think that means a paradigm shift is coming soon, which could be the next step in our evolution; and I, for one, welcome our new "supertasker" overloards, who will bring us to a new Golden Age of texting and driving, safely.