E-mail|Link|Comments () Posted by Carolyn Y. Johnson April 21, 2010 12:54 PM By Carolyn Y. Johnson, Globe Staff Popeye gulped cans of spinach to get a physical boost, but new research suggests that doing a good deed might have the same effect. A new study by a Harvard University scientist reports that people who help others or merely think about doing good (or evil) perform better on a test of phy