An climber ascends a silo covered in ice in Cedar Falls, Iowa, United States, January 17, 2016. The owners have connected hoses to the top of the silo and spray it with water in winter months to freeze the exterior for climbing. (Photo by Jim Young/Reuters)

A Russian air force technician reports to a pilot that a bomber is ready for a combat mission at Hemeimeem air base in Syria Wednesday January 20, 2016. Russian warplanes have flown over 5,700 combat missions since Moscow launched its air campaign in Syria on September 30, 2015. (Photo by Vladimir Isachenkov/AP Photo)

A Nicole Miller designed football is displayed at the unveiling of the CFDA Footballs Wednesday, January 20, 2016, at the NFL headquarters in New York. In celebration of Super Bowl 50 and in support of the NFL Foundation, the NFL and the Council of Fashion Designers of America have collaborated on 50 Bespoke Designer Footballs created by CFDA Members. (Photo by Frank Franklin II/AP Photo)

A pilot inflates a hot air balloon while taking part in the 38th International Balloon Festival of Chateau-d'oex, Switzerland, 23 January 2016. The festival takes place from 23 to 31 January. (Photo by Vincent Vannay/EPA)

A man carries a bag on his back in Guangzhou, Guangdong province, January 26, 2016. According to traffic police, over 2.9 billion trips will be made around China during the 40-day Spring Festival travel rush, which started on January 24. (Photo by Reuters/Stringer)

In this Thursday, January 28, 2016 photo, a “child angel” doll sits on a chair in Bangkok, Thailand. The dolls, which are said to bring good luck to their owners, became a media sensation this week after a leaked memo from a Thai budget airline gave pointers on how they could be treated like passengers if they have a paid-for seat. Thai people are superstitious, and the doll phenomenon has been analyzed as a modern version of a traditional totem containing real body parts, but as a fad it seems have more in common with Furby dolls. (Photo by Sakchai Lalit/AP Photo)

Roma people are seen in a Romani camp installed along La Petite Ceinture, an abandoned railroad line, in Paris, France, February 2, 2016. More than 350 Roma people, who have been living here since the last summer, face eviction from the makeshift camp this week. (Photo by Jacky Naegelen/Reuters)

Revellers take part in the traditional “Weiberfastnacht” (Women's Carnival) celebration in Mainz, Germany, February 4, 2016. Germany is celebrating its traditional carnival with tight security after assaults on women during New Year's Eve celebrations across the country. (Photo by Kai Pfaffenbach/Reuters)