Parrots hold the evolutionary secret of why we're left-handed or right-handed

Almost everybody has a dominant hand that they use, but it's actually a mystery why that is. After all, we can see both of our hands just as well, and there's no built-in reason why one should work better than the other. But some grabby parrots might hold the deep evolutionary reason behind handedness. »2/01/11 8:34pm2/01/11 8:34pm