REFILE - CORRECTING TYPOPriscilla Chan (R) embraces her husband Mark Zuckerberg while announcing the Chan Zuckerberg Initiative to "cure, prevent or manage all disease" by the end of the century during a news conference at UCSF Mission Bay in San Francisco, California, U.S. September 21, 2016. REUTERS/Beck Diefenbach TPX IMAGES OF THE DAY