Iranians flash the victory sign from their car while celebrating on a street in northern Tehran, Iran, Thursday, April 2, 2015, after Iran's nuclear agreement with world powers in Lausanne, Switzerland. The United States, Iran and five other world powers on Thursday announced an understanding outlining limits on Iran's nuclear program so it cannot lead to atomic weapons, directing negotiators toward achieving a comprehensive agreement within three months. (Photo by Ebrahim Noroozi/AP Photo)

In this Friday, November 6, 2015 photo dancers Alba Ibanez, right, and Luis Chavez, both from Spain, dress up backstage before taking part in the World Salsa Master dance competition in Madrid. Ten dance couples from different countries around the world performed in front of an audience of around 2,000 people. Participants – who wore bright, colorful outfits – came from the United States, Italy, Spain, Portugal, Mexico, Chile, Uruguay, Czech Republic and Venezuela. (Photo by Francisco Seco/AP Photo)

Yakutsk, a remote city in Eastern Siberia along the Lena River, is the coldest city in the world. Located 1840 km away from Irkoustk and 5000 km away from Moscow, this city founded in 1632 by the Cossacks imposes upon its inhabitants an extreme way of life. And yet, despite particularly harsh conditions, Yakutsk boasts a population of 270,000, or a quarter of the entire population of Siberia. No other place on the planet experiences the temperature extreme found here: in winter, the temperatures regularly fall to minus 40° (the coldest temperature recorded was –64°C) and in summer often reaches temperatures above 30°C. Photo: January 2013. A scene in Yakutsk, Siberia, the coldest city in the world. (Photo by Steeve Iuncker/Agence VU)

In this photo provided by Andreas Langreiter via Global-Newsroom, Hannes Arch of Austria performs during the finals of the first stage of the Red Bull Air Race World Championship in Abu Dhabi, United Arab Emirates, Saturday, February 14, 2015. (Photo by Andreas Langreiter/AP Photo/Global-Newsroom)

Participants demonstrate for the media before the role play event at Czocha Castle in Sucha, west southern Poland April 9, 2015. Harry Potter enthusiasts from all over the world are attending a four-day live action role play event at the medieval castle made into a close imitation of the “College of Wizardry”. (Photo by Kacper Pempel/Reuters)

Noriko Takatory of Japan shares a moment with her groom Moon Byung-nam of South Korea during an opening ceremony for upcoming mass wedding ceremony of the Unification Church at Cheongshim Peace World Centre in Gapyeong, South Korea, February 19, 2016. (Photo by Kim Hong-Ji/Reuters)

Figure Skating, ISU World Figure Skating Championships, Ladies Short Program, Boston, Massachusetts, United States on March 31, 2016: Ashley Wagner of the United States stumbles and falls while celebrating after competing. (Photo by Brian Snyder/Reuters)

A woman and a girl dressed in historical Red Army uniform, wait before watching the Victory Day parade, marking the 71st anniversary of the victory over Nazi Germany in World War Two, at Red Square in Moscow, Russia, May 9, 2016. (Photo by Grigory Dukor/Reuters)