WASHINGTON, DC - SEPTEMBER 29:  Bill Gates, founder of Microsoft and co-chair of the Bill and Melinda Gates Foundation, talks about the Ebola crisis in West Africa during the Politico 'Lessons from Leaders' series at the Bank of America offices September 29, 2014 in Washington, DC. Gates talked about how his foundation's work to erradicate polio in Nigeria has been helpful in starting to combat the Ebola epidemic in Liberia, Guinea and Sierra Leone, which is the largest outbreak ever recorded.  (Photo by Chip Somodevilla/Getty Images)