That's the finding of a new study examining the link between cognitive ability and handedness. Lefties score consistently lower on aptitude tests than righties, and left-handedness is cognitively equivalent to being born prematurely. Yeah...this one's going to be controversial.
How you take care of your body can have serious effects on the state of your mind...and either extreme might be bad for you. Two new studies reveal both obesity and strenuous exercise can be bad news for your brain.