Lefties

I have always been interested in the brain for obvious reasons and being left handed had leaded me to wonder why about ten percent of the people are left handed. No one has yet to explain why a person is left handed just like no one has ever explained why a person is trans. Are you born left handed or is it something that we learn; is it nature or nurture?
There was an article in the Hartford Courant yesterday about the latest thinking on the causes of left-handedness.

The brains of left-handed people develop more freely in utero, they say, allowing the organization to stray more from the standard design.

[…]

Other scientists are examining how LRRTM1 and other genes might tie left-handedness loosely with all sorts of characteristics. Various studies have found weak but statistically significant associations between left-handedness and schizophrenia, autism and even homosexuality.

[…]

There is some evidence, he says, that mixed-handers have a wider connecting pathway — called the corpus callosum — between the right and left hemispheres. Having a wider connection seems to make it harder to do more than one thing at a time — playing a different rhythm with each hand, for example.

The brain works in mysterious ways that we are just barely starting to understand.

Two years ago during the True Colors Conference (a GLBT youth conference), I was getting signatures for a petition for the Anti-discrimination Coalition and I noticed that a many of signers were left handed. I do not know the actual percentage but I do know that it made an impression on me at the time that there were so many lefties.
I am not saying that there is any links between being gender variant and left handedness but it does raise an interesting question.