Facebook CEO Mark Zuckerberg and his pediatrician wife, Dr. Priscilla Chan, announced this week that their Chan Zuckerberg Initiative will fund a $3 billion effort to cure all diseases. Mark Zuckerberg announced in December 2015 that he was going to give away 99 percent of his wealth. But instead of forming a traditional charity, he bequeathed his Facebook shares to his own Limited Liability Corporation, called the Chan Zuckerberg Initiative.