Managers who inundate their teams with the same messages, over and over, via multiple media, need not feel bad about their persistence.

FORBES: It's Not Nagging: The Power of Persistent, Redundant Communication

Professor McManus said the more likely explanation for the persistence of left-handedness was the need for individuals with a range of qualities and skills within societies.

BBC: NEWS | Health | Left-handers 'better in fights'