At a gathering, two of the world’s most well-known billionaires, Warren Buffett and Bill Gates, were asked to sum up their secret to success in a single word. Remarkably, both men provided the same answer: focus.

The Microsoft co-founder is accelerating his plan as the U.S. and other countries cut funding for global health. In addition, Warren Buffett has said his donations to the Gates Foundation would end with his death.