Apple is researching how one key on a MacBook Pro keyboard could be taken out, and used as a precision mouse.A removable key that doubles as a mouse is not intended to replace the trackpadApple does explore every conceivable take on keyboards, but a newly-revealed patent application details one that is simply peculiar. Prolific Apple inventor Paul X. Wang, whose previous work includes plans for a glass keyboard, proposes using a removable mouse.Read more