CENTRAL FALLS, R.I. — During their weekly phone calls, Fred Humphries Jr. said his father always asks him the same question: “What have you done to make sure people of color are exposed to STEM and have opportunity?”This week Humphries, corporate vice president of U.S. government affairs for Microsoft, can tell his father about the Central Falls High School computer science students he visited, hoping to “spark an interest” in the profitable field of [...]