And that thing is: Make money. And according to Career Builder .com, even though it's narrowing, there's still a big gender gap in that department.

The U.S. Census Bureau says that on average, women make 25 percent less than men. Which is an improvement since 1970 - when women made 41 percent less.

And even though education increases earnings for both sexes, it's stronger for men. The wage gap is the largest among the most highly educated groups, with the biggest difference being in the fields of medicine and health management. The smallest wage-gap is in traditionally male dominated fields like engineering - where women earn almost 90 percent as much as men.
But despite the discrepancies, more women than men have smiles on their faces. Career Builder.com's "Pulse of the Worker" survey found that despite lower raises, fewer bonuses, and lower expectations of being promoted, women were more likely than men to report that they were happy with their jobs.