A character trait in psychopaths has been identified by scientists as a common thread in successful US presidents.

Fearless dominance, which is linked to less social and physical apprehensiveness, boosts leadership, persuasiveness, crisis management and congressional relations, according to new research.

Recent presidents have been taller than the average American man.Americans, whether they know it or not, prefer taller leaders, a preference that dates back to the dawn of the human race.And bald men are perceived to be more dominant, more athletic and better leaders.