A man is doused with milk and sprayed with mist after being hit in the eyes with an irritant during protests in Ferguson, Missouri, on August 20. | (REUTERS/Adrees Latif)

Ethnic Dong women work at a tea leaf processing factory in Guizhou province, China, in April. | (REUTERS/Sheng Li)

The New York Yankees' Derek Jeter celebrates after hitting a game-winning single against the Baltimore Orioles on September 25, in his very last at bat in New York City. | (AP Photo/Julie Jacobson)

Nine-year-old Nowa Paye is taken to an ambulance after showing signs of the Ebola infection in Liberia on September 30. | (AP Photo/Jerome Delay, File)

A sloth peeks out from behind a door on a floating house in the "Lago do Janauari," near Manaus, Brazil. | (AP Photo/Felipe Dana)

A worker cleans a stage in preparation for New York Democrat Andrew Cuomo's gubernatorial election celebration on November 4. | (REUTERS/Lucas Jackson)

A firefighter battling September's King Fire watches as a blaze burns along Highway 50 in Fresh Pond, California. (REUTERS/Noah Berger)

A relative of 32-year-old Palestinian Fadel Halawa, whom medics say was shot dead by Israeli forces, mourns over the body during a November funeral in Gaza City. | (REUTERS/Suhaib Salem)

A Russian Space Training Center employee hangs space suits out to dry on July 2, after astronauts practiced a water landing. | (AP Photo/Alexander Zemlianichenko)

Brides sit quietly as they wait to take their wedding vows during a mass ceremony in New Delhi, India, in March. | (REUTERS/Anindito Mukherjee)

A masked pro-Russian protester sits on a chair inside a regional government building in Donetsk, eastern Ukraine, on April 25. | (REUTERS/Marko Djurica)

People march through the streets of Los Angeles on August 13, as part of a 300-mile trek from Merced County to the U.S.-Mexico border, in an awareness campaign for the plight of undocumented immigrant mothers and their children. | (REUTERS/Lucy Nicholson)

New Zealand's Lyndon Sheehan gets air during the men's ski halfpipe final, during February's Sochi Olympics. | (AP Photo/Andy Wong)

Queen Elizabeth checks out the Iron Throne during a meeting with members of HBO's Game of Thrones cast in Belfast, Northern Ireland, on June 24. | (REUTERS/Phil Noble)

A decidedly disappointed Argentine fan stands between policemen as they welcome the country's soccer team back following their loss to Germany in July's World Cup final. | (REUTERS/Ivan Alvarado)

Yazidi refugees walk toward the Syrian border on August 11. The rise of the Islamic State in parts of Iraq and Syria prompted tens of thousands of Yazidis and Christians to flee for their lives. | (REUTERS/Rodi Said)