Stuff That Blows Your Mind just released the latest podcast on lefties: http://www.stufftoblowyourmind.com/podcasts/left-handed-scissors/ I do not believe I have much of a cognitive advantage over righties. On a positive note, I can write in cursive script with both hands–it appears what I learned from my right hand I can directly transfer to my left. I guess that is an advantage that the left can mimick the right in most things. 
