SHORT & ARSEY

Could you be a psycho like Hitler?

1 Psychopaths have a personality disorder where they lack guilt and empathy with other people. Scientists say they can be highly manipulative but also charming and not necessarily violent. They are also more likely to be unfaithful.

2 US psychiatrist Hervey Cleckley first listed 16 traits of psychopaths in his 1941 book The Mask of Sanity.

3 US It's estimated one in 100 people have psychopathic tendencies. An Australian study found this rises to one in five in company CEOs about the same rate as among prisoners.

4 Researchers from Denmark also found psychopaths are more likely to study for degrees in economics and business also studies. Lawyers come high up the list.

5 Those who like city life are more likely to show psychopathic traits than those connected to nature, say experts at the University of Derby.