Ann Marie Ryan, Michigan State University (IMAGE) Michigan State University Caption Michigan State University psychology professor Ann Marie Ryan says people who are single and childless have difficulty finding time to pursue interests outside the workplace, just like those with spouses and kids. Credit Michigan State University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.