Storm clouds and snow blows off Lake Erie in Buffalo, New York, November 18, 2014. An autumn blizzard dumped a year's worth of snow in three days on Western New York state, where five people died and residents, some stranded overnight in cars, braced for another pummeling expected later on Wednesday. (Photo by Lindsay DeDario/Reuters)

Ivan Timofeenko, co-founder of “Newton Park”, a private interactive museum of science, dumps a bucket of cold liquid nitrogen on himself during a flash mob at the Krasnoyarsk Museum Centre in Krasnoyarsk, Siberia, November 20, 2014. Timofeenko and several other enthusiasts poured cold liquid nitrogen on themselves, bearing the temperature of about minus 196 degrees Celsius (minus 320.8 degrees Fahrenheit), while taking part in an event resembling the popular "Ice Bucket Challenge" project and aimed at the popularization of natural sciences among children and teenagers. The experiment demonstrated the Leidenfrost effect phenomenon, in which a liquid produces a layer of insulating vapour that prevents the liquid getting into a direct contact with a surface much hotter than the liquid's boiling point, according to organizers. (Photo by Ilya Naymushin/Reuters)

Yevgeny Panteleikin, a local blogger, dumps a bucket of cold liquid nitrogen on himself during a flash mob on the embankment of the Yenisei River in Krasnoyarsk, Siberia, November 20, 2014. (Photo by Ilya Naymushin/Reuters)

A boy searches for coins in Bagmati River flowing through the premises of Pashupatinath Temple during the Bala Chaturdashi festival in Kathmandu November 20, 2014. The festival is celebrated by the worshippers by lighting oil lamps and scattering seven types of grains known as “sat biu” honouring the departed along a route at the temple. (Photo by Navesh Chitrakar/Reuters)

A vendor displays a mixture of seven types of grains known as “sat biu” at Pashupatinath Temple during the Bala Chaturdashi festival in Kathmandu November 20, 2014. (Photo by Navesh Chitrakar/Reuters)

Gold bars from the vault of a bank and Swiss one franc coins are seen in this illustration picture taken in Zurich November 20, 2014. The “Save our Swiss gold” proposal, spearheaded by the right-wing Swiss People's Party (SVP), aims to ban the central bank from offloading its reserves and oblige it to hold at least 20 percent of its assets in gold. The referendum is scheduled for November 30. The SVP argues it would secure a stable Swiss franc. (Photo by Arnd Wiegmann/Reuters)

Brazil's President Dilma Rousseff is seen while boarding a helicopter from the Brazilian Air Force at the Alvorada Palace in Brasilia November 20, 2014. (Photo by Ueslei Marcelino/Reuters)

A girl walks past riot policemen guarding one of the access roads to Benito Juarez International airport after demonstrators staged a protest over the 43 missing Ayotzinapa students in Mexico City November 20, 2014. Forty-three missing students abducted by corrupt police in southwest Mexico weeks ago were apparently incinerated by drug gang henchmen and their remains tipped in a garbage dump and a river, the Mexican government said. (Photo by Tomas Bravo/Reuters)

A masked demonstrator throws a petrol bomb towards riot police during a protest over the 43 missing Ayotzinapa students, near the Benito Juarez International airport in Mexico City November 20, 2014. Masked demonstrators threw Molotov cocktails and shot fireworks at police near Mexico City's airport on Thursday as thousands prepared to protest President Enrique Pena Nieto's handling of the apparent massacre of 43 trainee teachers after their abduction on the night of September 26. (Photo by Carlos Jasso/Reuters)

Activists, wearing Guy Fawkes masks, block traffic while protesting the shooting of Michael Brown, outside the Ferguson Police Station in Missouri, November 19, 2014. Residents of Ferguson prepared on Wednesday for a grand jury report expected soon on the fatal August shooting of Brown, an event that laid bare long-simmering racial tensions in the St. Louis suburb. (Photo by Adrees Latif/Reuters)

People view a Toyota Future Mobility Concept car at the 2014 Los Angeles Auto Show in Los Angeles, California November 20, 2014. (Photo by Lucy Nicholson/Reuters)

Members of the media take a break next to a crash test dummy at the 2014 Los Angeles Auto Show in Los Angeles, California November 20, 2014. (Photo by Lucy Nicholson/Reuters)

People stop to take pictures of naked women from the People for the Ethical Treatment of Animals (PETA) painted to resemble orca whales as they protest outside Macy's department store in New York, November 20, 2014. Members of PETA demonstrated on Thursday against this year's Macy's Thanksgiving Day Parade that will include a SeaWorld float. (Photo by Brendan McDermid/Reuters)

U.S. Navy and Japan Maritime Self-Defense Force ships steam in formation during their military manoeuvre exercise known as Keen Sword 15 in the sea south of Japan, in this November 19, 2014 handout provided by the U.S. Navy. Japan stepped up its role in large-scale war games with the U.S. this week, with one of its admirals commanding air and sea manoeuvres that the U.S. military described as the most complex ever overseen by the Japanese navy. The Keen Sword exercises involving more than 30,000 Japanese troops and 11,000 U.S. personnel come as Japanese Prime Minister Shinzo Abe seeks a higher profile for Japan in the security alliance. (Photo by Mass Communication Specialist 3rd Class Chris Cavagnaro/Reuters/U.S. Navy)

The Soyuz TMA-15M spacecraft is rolled out to the launch pad by train at the Baikonur Cosmodrome on November 21, 2014 in Baikonur, azakhstan. The Launch of the Soyuz rocket is scheduled for November 24 and will carry Expedition 42 Soyuz Commander Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos), Flight Engineer Terry Virts of NASA and Flight Engineer Samantha Cristoforetti of the European Space Agency into orbit to begin their five and a half month mission on the International Space Station. (Photo by Aubrey Gemignani/NASA via Getty Images)

People take photos of the Russia's Soyuz-FG booster rocket with the space capsule Soyuz TMA-15M that will carry a new crew to the International Space Station (ISS), fixing vertical at the launch pad in Russian leased Baikonur cosmodrome, Kazakhstan, Friday, November 21, 2014. Start of the new Soyuz mission is scheduled on Monday, November 24. (Photo by Dmitry Lovetsky/AP Photo)

The Soyuz TMA-15M spacecraft is set on its launch pad at the Baikonur cosmodrome November 21, 2014. The Soyuz is scheduled to blast off with Anton Shkaplerov of Russia, Terry Virts of the U.S. and Samantha Cristoforetti of Italy to the International Space Station on November 24, 2014. (Photo by Shamil Zhumatov/Reuters)

Service towers lift the Russia's Soyuz-FG booster rocket with the space capsule Soyuz TMA-15M that will carry a new crew to the International Space Station (ISS) at the launch pad at the Russian leased Baikonur cosmodrome, Kazakhstan, Friday, November 21, 2014. (Photo by Dmitry Lovetsky/AP Photo)

Participants wait backstage before the country's first ever transgender/transsexual fashion show in Istanbul late November 20, 2014. The fashion show was organized by Istanbul's LGBTI (lesbian, gay, bisexual, transgender, intersex) community to raise funds to improve the facilities of a local LGBTI shelter. (Photo by Yagiz Karahan/Reuters)

A participant presents a creation during the country's first ever transgender/transsexual fashion show in Istanbul late November 20, 2014. (Photo by Yagiz Karahan/Reuters)

A participant gets ready backstage for the country's first ever transgender/transsexual fashion show in Istanbul late November 20, 2014. (Photo by Yagiz Karahan/Reuters)

A transsexual participant is prepared for the first transexual fashion show organized by the Lesbian, Gay, Bisexual and Transgender initiative LGBT Turkey in Istanbul, Turkey, 20 November 2014. (Photo by Sedat Suna/EPA)

A transsexual participant is prepared for the first transexual fashion show organized by the Lesbian, Gay, Bisexual and Transgender initiative LGBT Turkey in Istanbul, Turkey, 20 November 2014. (Photo by Sedat Suna/EPA)

A building under construction is seen amidst smog on a polluted day in Shenyang, Liaoning province November 21, 2014. Hurt by a cooling property sector, erratic foreign demand and slackening domestic investment growth, China's economy is seen posting its weakest annual growth in 24 years this year at 7.4 percent. (Photo by Jacky Chen/Reuters)

French soldiers from Operation Barkhane patrol in Timbuktu, November 5, 2014. If the French army and its allies are to keep al Qaeda at bay in the desert of northern Mali they must stop them seizing the biggest prizes in the sea of white sand – the wells. So this month a column of soldiers from France, Burkina Faso and Mali, in armoured vehicles and pick-up trucks, churned toward a village north of Timbuktu where herders water camels and goats. They were looking for signs of infiltration by militants who need water as much as the locals do and aim to convert villages to their ideology. (Photo by Joe Penney/Reuters)

Mascots from other editions of the Summer Olympic Games (L-R) Fu Niu Lele (Beijing 2008), Wenlock (London 2012), Misha (Moscow 1980), Mandeville (London 2012) and Athena (Athens 2004) pose for a picture on top of Sugar Loaf mountain in Rio de Janeiro November 21, 2014. This is the first time that mascots from previous Olympic games are visiting the current Olympic host city, ahead of the first public appearance of the 2016 mascots on November 24. (Photo by Sergio Moraes/Reuters)

A performance activist protests against “police brutality” by taking part in a mock lynching near the Gateway Arch in St. Louis, Missouri November 21, 2014. Hundreds of civil rights lawyers from across America are descending on Ferguson, Missouri as police and protesters prepare for a grand jury decision on whether to charge the officer who killed an unarmed black teenager in August. (Photo by Adrees Latif/Reuters)

An aerial view of a flooded area near Lake Maggiore shows a farm surrounded by water near the village of Magadino in Ticino, Switzerland, 16 November 2014. Heavy rain has caused flooding in the region. (Photo by Gabriele Putzu/EPA)

In this November 16, 2014 picture an aerial view shows the floods at Lake Maggiore near Mogadino, in southern Switzerland. Heavy rainfalls caused flooding in southern France, northern Italy and landslides in southern Switzerland. (Photo by Gabriele Putzu/AP Photo/Keystone/Ti Press)

An ice crust builds up on a warning sign that reads “Caution Ice” on the Brocken mountain peak near Schierke, Germany, 19 November 2014. Meteorologists say that the Brocken is currently the coldest spot in the Harz mountainous region. At minus 5 degrees Celsius and strong winds on the Brocken peak these days the rain often freezes into strange ice formations. (Photo by Matthias Bein/EPA)