Gates has told students on numerous occasions that one of his big regrets upon leaving Harvard was his lack of awareness of the world's imbalances in health, wealth, and resources.
In his 2007 Harvard commencement speech, Gates told graduates to consider the responsibility of being so aware of those realities and perhaps even correct them.
"I hope you've had a chance to think about how, in this age of accelerating technology, we can finally take on these inequities, and we can solve them," he said.