People look at the illuminated Bellas Artes palace during the International Festival of Lights in downtown of Mexico City, Mexico, November 11, 2016. Photo by Carlos Jasso.

An environmental activist adjusts his mask while taking part in «The Dead Sea Swim Challenge», swimming from the Jordanian to Israeli shore, to draw attention to the ecological threats facing the Dead Sea, in Kibbutz Ein Gedi, Israel, November 15, 2016. Photo by Nir Elias.

Men work on a farm in a village on the outskirt of Zaria in Nigeria’s northern state of Kaduna, November 15, 2016. Photo by Akintunde Akinleye.

Hillary Clinton walks from the stage after speaking to the Children’s Defense Fund in Washington, U.S., November 16, 2016. Photo by Joshua Roberts.

A man looks at a phone during the third annual World Internet Conference in Wuzhen town of Jiaxing, Zhejiang province, China, November 17, 2016. Photo by Aly Song.

Hooded protesters walk amid smoke during clashes following a rally marking the 43nd anniversary of a 1973 student uprising against the military dictatorship that was ruling Greece, in Athens, Greece, November 17, 2016. Photo by Alkis Konstantinidis.

Singer Robbie Williams performs during the Bambi 2016 media awards ceremony in Berlin, Germany, November 17, 2016. Photo by Hannibal Hanschke.

The International Space Station (ISS) crew member Thomas Pesquet of France looks on during a space suit check at the Baikonur cosmodrome, Kazakhstan, November 17, 2016. Photo by Shamil Zhumatov.

U.S. President Barack Obama is welcomed by German Chancellor Angela Merkel upon his arrival at the chancellery in Berlin, Germany, November 17, 2016. Photo by Fabrzio Bensch.

A worker adjusts the U.S. flag before Japanese Prime Minister Shinzo Abe addresses media following a meeting with President-elect Donald Trump in Manhattan, New York, U.S., November 17, 2016. Photo by Andrew Kelly.

The Soyuz MS-03 spacecraft carrying the crew of Peggy Whitson of the U.S., Oleg Novitskiy of Russia and Thomas Pesquet of France blasts off to the International Space Station (ISS) from the launchpad at the Baikonur cosmodrome on this long exposure picture, Kazakhstan, November 18, 2016. Photo by Shamil Zhumatov.

A petrol bomb explodes among riot policemen during clashes following a rally marking the 43nd anniversary of a 1973 student uprising against the military dictatorship that was ruling Greece, in Athens, Greece, November 17, 2016. Photo by Alkis Konstantinidis.

Avril Garcia of Mexico City rides the Staten Island Ferry in New York, U.S., November 17, 2016. Photo by Andrew Kelly.

A general view of Buckingham Palace in central London, Britain, 18 November, 2016. Photo by Hannah McKay.

People displaced by fighting in and around Mosul bed down in a trench marking the boundary of Kurdish territory near Bashiqa, Iraq, November 18, 2016. Photo by Goran Tomasevic.