Men often aggress in response to status threats. In 2005, John Anderson (right) called Russell Tavares (left) a “nerd” on a social networking site. So Tavares got in his car, drove 2100 km, and burned down Anderson’s trailer. “I didn’t think anybody was stupid enough to try to kill anybody over an Internet fight,” said Anderson. Tavares was later sentenced to 7 years in prison.

AP PHOTO/MCLENNAN COUNTY SHERIFF’S DEPARTMENT and AP PHOTO/JERRY LARSON