Ducklings followed their mother through Killian Court just before Grameen Bank founder and Nobel laureate Muhammad Yunus told the Class of 2008 that "big problems are most often just an aggregation of tiny problems." The microlending pioneer urged every grad to follow his lead by starting a small, socially conscious business to address such problems: "If it works out, the whole world can be changed by replicating it in thousands of locations."

Credit: Sarah Putnam