President Obama watches a student Tuesday during his visit to classrooms at TechBoston Academy in Boston. Melinda Gates (center) is the co-chair of the Bill and Melinda Gates Foundation. (Associated Press)

Photo by: Pablo Martinez Monsivais

President Obama watches a student Tuesday during his visit to classrooms at TechBoston Academy in Boston. Melinda Gates (center) is the co-chair of the Bill and Melinda Gates Foundation. (Associated Press)