HANDEDNESS: Photodude links to the news that left-handers have different brains. I will withdraw, like he did, the meat of the article:

People who grow up left-handed have a different, more flexible brain structure than those born to take life by the right hand, say researchers at the University of California, Los Angeles, who used twins to study heredity.

The reason is that right-handers have genes that force their brains into a slightly more one- sided structure, according to research published yesterday in the Proceedings of the National Academy of Sciences. Left-handers appear to be missing those genes.

"There really is a difference in brains that results in a more symmetric brain in left-handers, where the two sides are more equal," said UCLA neurogeneticist Daniel Geschwind, who led the research team. "There is more flexibility, and that is under genetic control."

In Toynebeean terms lefties are the creative minority driving civilization. I'm sure this is the consensus opinion of modern history and biology.