Genes that play a role in the orientation of internal organs may also affect whether someone is right- or left-handed, new research suggests.
The study, published today (Sept. 12) in the journal PLOS Genetics, suggest those genes may also play a role in the brain, thereby affecting people's handedness.
Still, the findings can't yet explain the mystery of why a minority of people are left-handed because each gene only plays a tiny role in people's handedness.