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Editor's note: Robert Kirk studied nursing on evenings and weekends before retiring at age 60 from is career as a materials scientist. With a master's and doctorate in chemistry from Yale University, he spent much of his career working for 3M, General Electric and Allied Chemical. Two years into his next career — nursing — he works three days a week in the float pool at Bethesda Rehabilitation Hospital in St. Paul, Minnesota. He also volunteers at a free community clinic and with the American Red Cross. We asked him to discuss his post-retirement career change.