Pakistani worshippers on Dec. 19, 2014, attend a prayer for the victims killed in the Taliban attack on a military-run school in Peshawar, Pakistan.
Fareed Khan/AP Photo
Vehicles pass through fog during a cold and foggy morning, Dec. 18, 2014, in Noida, India.
Sunil Ghosh/Hindustan Times/Getty Images
A student is detained during a demonstration near the Ministry of Education at Santiago, Chile, Dec. 18, 2014.
A view from the roof of Commercial Travellers Club building in Martin Place of the thousands of floral tributes for deceased hostages Tori Johnson and Katrina Dawson, Dec. 18, 2014, in Sydney.
Cole Bennetts/Getty Images
World champion boxer Carl Frampton pictured before the press conference to announce the IBF World Super Bantamweight Championship fight between Carl Frampton and Chris Avalos at The Europa Hotel, Dec. 18, 2014 in Belfast, Northern Ireland.
Charles McQuillan/Getty Images
Coast Guard members conduct flare training on Plum Island, Mass. Dec. 15, 2014.
Petty Officer 3rd Class MyeongHi Clegg/ U.S. Coast Guard/Reuters
Tom Messenger is unseated at a race, Dec. 18, 2014, in Towcester, England.
Alan Crowhurst/Getty Images
Soldiers shout as they practice in Heihe, China, Dec.16, 2014.
Students of Govt Primary School Village Pochanpur pay tribute to the victims of Peshawar school attack, Dec. 17, 2014, in New Delhi.
Vipin Kumar/Hindustan Times/Getty Images
Condolence messages are written on the pavement as a sign of respect at Martin Place, Dec. 17, 2014, in Sydney.
Joosep Martinson/Getty Images
Bangladeshi children, covered in mud to look like freedom fighters, attend a rally during the Victory Day celebration in Gazipur, Bangladesh, Dec. 16, 2014.
A Pakistani man comforts a student at the bedside of a boy who was injured in a school attack by the Taliban in Peshawar, Pakistan, Dec. 16, 2014.
Mohammad Sajjad/AP Photo
A car overturns during the Master Cross Race 2014 at Suuj Uul outside Ulan Bator, Mongolia, Dec. 14, 2014.
A person kneels down near a Christmas light installation in Nice, France, Dec. 16, 2014.
Valery Hache/AFP/Getty Images
Shi'ite Muslim pilgrims reach out to touch the tomb of Imam al-Abbas located inside the Imam al-Abbas shrine, to mark Arbain, in the holy city of Kerbala, Iraq, Dec.13, 2014.
A hostage runs to armed tactical response police officers for safety after she escaped from a cafe under siege at Martin Place in the central business district of Sydney, Dec. 15, 2014.
Rob Griffith/AP Photo
Palestinian members of al-Qassam Brigades, the armed wing of the Hamas movement, rappel from a building upside down during a military parade marking the 27th anniversary of Hamas' founding, in Gaza City, Dec. 14, 2014.
A man dressed as ‘Father Christmas’ aka Santa Claus climbs down the Kollhoff-Tower in Berlin, Dec. 14, 2014.
Tobias Schwarz/AFP/Getty Images
A volunteer looks for a grave to place a wreath on during ‘National Wreaths Across America Day’ at Arlington National Cemetery, Dec. 13, 2014, in Arlington, Va.
Mark Wilson/Getty Images
Young boys watch from a seat in a charter bus as demonstrators march along Michigan Avenue to protest police abuse, Dec. 13, 2014, in Chicago.
Scott Olson/Getty Images