Am I Left-handed or Right-handed? 23andWe Wants to Know.

Why does 23andWe want to know? It's for their featured research project titled "Handedness".
According to 23andMe, little is known about why people become left-handed or right-handed. They think they can help the science community figure out what genetic component is linked to handedness by polling the 23andMe community and comparing their answers against their [...]