Turkish soldiers during the military operation in Syria on Sunday. Turkey launched the raid to evacuate some 40 soldiers guarding the Tomb of Suleyman Shah, grandfather of the founder of the Ottoman Empire. Xinhua/Landov hide caption

itoggle caption Xinhua/Landov

Britain's Foreign Secretary Philip Hammond and Secretary of State John Kerry deliver a statement at a news conference in London, today. Kerry said the two were going to discuss the possibility of further sanctions against Russia amid cease-fire violations in eastern Ukraine. Neil Hall/AP hide caption

itoggle caption Neil Hall/AP

U.S. Defense Secretary Ash Carter (center left) is greeted with a military honor guard as he arrives to meet Afghan President Ashraf Ghani at the Presidential Palace in Kabul, Afghanistan, on Saturday. Jonathan Ernst/AP hide caption

itoggle caption Jonathan Ernst/AP

A blue whale is seen in Timor waters in an undated photo. The marine mammal buttresses Cope's rule, the notion that over the course of evolution, most animals tend to get bigger. Kiki Dethmers/AP hide caption

itoggle caption Kiki Dethmers/AP

Pedestrians brave the cold during their morning commute on Friday in New York. Arctic air and bitterly cold wind is moving across the Northeast, plunging temperatures into record-low single digits, accompanied by subzero wind chills. John Minchillo/AP hide caption

itoggle caption John Minchillo/AP