That Wild Streak? Maybe It Runs in the Family - New York Times: "Jason Dallas used to think of his daredevil streak — a love of backcountry skiing, mountain bikes and fast vehicles — as 'a personality thing.'

Jason Dallas of Seattle says he believes he is genetically predisposed toward risky behavior like backcountry skiing and mountain biking. Then he heard that scientists at the Fred Hutchinson Cancer Research Center in Seattle had linked risk-taking behavior in mice to a gene. Those without it pranced unprotected along a steel beam instead of huddling in safety like the other mice. "

future trend: genetic interventions to modify personality traits.