Is there a hero gene, naturally giving someone the characteristics of a hero? According to one study, the answer might rest in the type of heroism we are addressing.
In a paper published in 2010, researchers reported that people who engaged in one-time acts of bravery (like rushing into a burning building or rescuing someone from the path of an oncoming train) are not necessarily that much different from control groups of non-heroes.
By contrast, people who engage in lifelong heroism (such as professional nurses who regularly comfort the sick and dying) do share a number of important personality traits such as empathy, nurturance, and a need to live by a moral code