I am also left-handed. I heard that left handed people are more creative one as they use heavily right hemisphere of their brains. They are good at art, music, etc.. Another fact that as mentioned above, to be able to use both hands is more advantageous because when we use both hand it means that we use both of hemispheres actively. Using both hands improves brain and imagination, mathematic and thinking skills. Although i am left handed person, I started to use my right hand and do exercises for 20 minutes by writing something on a piece of paper. This is a good exercise to improve my intelligence. There are more exercises to do this..