Bill Gates returned to Harvard in 2007—thirty-two years after dropping out—to deliver the commencement address and finally receive an honorary degree. In what became one of the most celebrated commencement speeches of the decade, Gates challenged the assumption that people don't act on global problems because they don't care enough. Gates argued that the real obstacle is complexity. People see human tragedies that break their hearts, yet do nothing—not from indifference, but because they don't know what to do. He laid out a framework for cutting through that complexity: see the problem clearly, find a solution, and measure the impact. This insight became a cornerstone of the Gates Foundation's approach to philanthropy, and Gates urged Harvard's graduates to use their education to simplify the world's most daunting challenges so that the caring people already feel can be translated into meaningful action.