Workers clean one of the four faces of the Great Clock, which contains the Big Ben bell, in London. | (Oli Scarff/Getty Images)

A police helicopter flies over Ferguson, Missouri, during violent unrest sparked by the fatal shooting of unarmed black teenager Michael Brown by a white policeman. | (REUTERS/Lucas Jackson)

Newborn giant panda triplets snooze inside an incubator at the Chimelong Safari Park in Guangzhou, China. | (REUTERS/Stringer)

A man gets a shave from a roadside barber in New Delhi as another waits for his turn. | (REUTERS/Anindito Mukherjee)

Athletes compete in a heat of the women's 200-meter freestyle at the 2014 Nanjing Youth Olympic Games in China. | (REUTERS/Aly Song)

A man is doused with milk and sprayed with mist during protests in Ferguson, Missouri. | (REUTERS/Adrees Latif)

A woman takes an eye test in east London. | (REUTERS/Olivia Harris)

People and their dogs attend Mass on Dog Day, which celebrates San Roque, the patron saint of dogs, in Bolivia. | (AP Photo/Juan Karita)

Farmer Martin Hagen inspects his Gala apple trees ahead of the harvest in Kressbronn, southern Germany. | (REUTERS/Michaela Rehle)

Students dressed as Hindu Lord Krishna (center) and his consort Radha (right) offer prayers during celebrations marking the Janmashtami festival in the western Indian city of Ahmedabad. | (REUTERS/Amit Dave)

Members of the Field Marshall Montgomery Pipe Band celebrate their victory at the annual World Pipe Band Championships at Glasgow Green, in Scotland. | (REUTERS/Russell Cheyne)

A Palestinian boy looks out of a car window in Gaza City as he and his family flee the violence stemming from the Israel-Hamas conflict. | (REUTERS/Suhaib Salem)

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