ALKIS KONSTANTINIDIS / Reuters
A migrant boy runs with a balloon outside the former Olympic Tae Kwon Do stadium in Faliro, Greece, a suburb of Athens, on Dec. 16, 2015. Migrants were being housed temporarily at the stadium.
Bill Tiernan / The Virginian-Pilot via AP
Kyle Blessing hugs his fiancee, Petty Officer 2nd Class Sophie Mulkey, left, as Petty Officer 2nd Class Dan Ravo kisses his girlfriend, Kelly Rancier, alongside the guided-missile destroyer McFaul after returning to the naval station in Norfolk, Virginia, on Dec. 14, following an eight-month deployment.
AMER ALMOHIBANY / AFP - Getty Images
Syrian Abu Mohammed, covered with dust from explosions, walks in his home following reported air strikes by regime forces on the town of al-Nashabiyah in the eastern Ghouta region, a rebel stronghold east of the capital Damascus, on December 14, 2015. United Nations aid chief Stephen OBrien said that the "indiscriminate attacks" against civilians in Damascus and the surrounding region were "unacceptable" at the end of a visit to Syria. AFP PHOTO / AMER ALMOHIBANYAMER ALMOHIBANY/AFP/Getty Images
Security officers wear gas masks after Kosovo opposition lawmakers released a tear gas canister to disrupt a parliamentary session in the capital Pristina on Dec. 14. The disruption was the latest attempt to pressure the government into renouncing deals with Serbia and Montenegro.
Visar Kryeziu / AP
Oded Balilty / AP
A veterinary technician feeds a horse at the Hebrew University's Koret School of Veterinary Medicine in Rishon Lezion, Israel on Dec. 7, 2015. Veterinarians at the hospital operate on about two dozen horses a month and rely on elaborate tools and an army of volunteers to safely treat animals that can weigh more than 1,000 pounds (450 kilograms). (AP Photo/Oded Balilty)
Mel Evans / AP
People take advantage of unseasonably warm weather to fish on the Delaware River Sunday, Dec. 13, 2015, near Yardley, Pa. (AP Photo/Mel Evans)
Photographers watch as the Soyuz TMA-19M spacecraft carrying the crew of Timothy Peake of Britain, Yuri Malenchenko of Russia and Timothy Kopra of the U.S. blasts off to the International Space Station (ISS) at the Baikonur cosmodrome in Kazakhstan on Dec. 15.
Gallery: Month in Space
SHAMIL ZHUMATOV / Reuters
CAGDAS ERDOGAN / AFP - Getty Images
An armed Kurdish militant walks in the Okmeydani district of Istanbul during a demonstration against recent curfews imposed on Kurdish towns on December 15, 2015. The Turkish government has been waging a relentless offensive aimed at crippling the rebel Kurdistan Workers' Party (PKK), which has staged a string of attacks against security forces in Turkey since a two-year-old ceasefire fell apart in late July. Clashes have been erupting in Turkey amid growing anger over the imposition of curfews to back up anti-PKK operations. / AFP / CAGDAS ERDOGANCAGDAS ERDOGAN/AFP/Getty Images
Refugees and migrants on a dinghy approach the Greek island of Lesbos on Dec. 17.
According to the International Organization for Migration, more than 920,000 people have entered the EU so far this year. The influx has overwhelmed national border guards and reception capacities, notably in Greece, where some 770,000 migrants have arrived, most of them from Turkey.
Santi Palacios / AP
A photographer prepares to take pictures of the annual Geminid meteor shower on the Elva Hill, in Maira Valley, near Cuneo, northern Italy, on Dec. 12.
MARCO BERTORELLO / AFP - Getty Images
Droid BB-8 arrives at the world premiere of the film "Star Wars: The Force Awakens" in Hollywood on Dec. 14.
MARIO ANZUONI / Reuters
FRANK RUMPENHORST / EPA
A merry-go-round is seen through a raindrops covered lens at the Christmas market in Frankfurt am Main, Germany, 16 December 2015. EPA/FRANK RUMPENHORST RAINDROPS ON CAMERA LENS
Stephanie Keith / Getty Images
NEW YORK, NY - DECEMBER 12: Men dressed as a Santa drink at a bar called The Hall during the annual SantaCon pub crawl December 12, 2015 in the Brooklyn borough of New York City. Hundreds of revelers take part in the holiday pub crawl, though some local bars and businesses have banned participants in an effort to avoid the typically rowdy SantaCon crowds. (Photo by Stephanie Keith/Getty Images)