Facebook CEO Mark Zuckerberg and his wife Priscilla Chan recently made headlines for their $25 million donation to the Centers for Disease Control Foundation to help fight Ebola. The young Zuckerbergs aren’t the only ones giving back in a big way: Bill and Melinda Gates have donated billions of dollars of their fortune to make the world a better place, as have many of the world’s ultra-wealthy, from professional athletes, to actors, to successful entrepreneurs. The masses believe people become wealthy through luck, good fortune, or social advantage.