U.C. Berkeley researchers find that the old saying, '"happy wife, happy life," might be true.  

Researchers took a look at more than 150 East Bay heterosexual married couples over the span of 25 years and determined that the key to a long marriage lies in the wife's ability to calm down after an argument.  

Researchers found that wives with the genetic ability to regulate serotonin, a hormone that plays a part in mood regulation, have a higher rate of marital satisfaction.  

The research showed that a husband's ability to control his mood after an argument did not affect the satisfaction in the marriage.