People are quite settled on the idea that Leonardo da Vinci was a pretty impressive guy. To most, he was far ahead of his time and was a bit of a genius. However, it seems that he had another talent that was in its own right very impressive.
Apparently, da Vinci had the amazing ability to write with one hand and, at the same time, draw with the other. Of course, he would be pretty good at doing both things together and would be better at it than the majority of individuals, but go ahead and try to do it on your own. The chances are that one of the things will end up looking not even remotely close to anything that is able to be recognized.