Swiss Social Democratic Party (SPS) vice president Cedric Wermuth speaks during the lower house parliament session in Bern, Switzerland September 21, 2016. REUTERS/Ruben Sprich

Mylan NL CEO Heather Bresch is sworn in before a House Oversight and Government Reform Committee hearing on the Rising Price of EpiPens, at the Capitol in Washington, U.S. September 21, 2016. REUTERS/Yuri Gripas

Mylan NL CEO Heather Bresch arrives to testify before a House Oversight and Government Reform Committee hearing on the Rising Price of EpiPens, at the Capitol in Washington, U.S. September 21, 2016. REUTERS/Yuri Gripas

Mark Zuckerberg announces 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

Pricilla Chan tears up as she announces 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

Mark Zuckerberg announces 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

Pricilla Chan announces 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

Pricilla 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