A Nepalese Army soldier demonstrates his horse riding skills during the Ghode Jatra festival, an annual horse race festival, in Kathmandu, Nepal, Friday, March 20, 2015. According to legend, the festival is held to celebrate the victory over a demon named Tundi who lived in the area known as Tundikhel and is believed that the clamor of horses hooves on Ghode Jatra keeps the demon's spirit away. (Photo by Niranjan Shrestha/AP Photo)

Britain's first “poo bus”, which runs on human and household waste, goes on display to the public so they can get up close an personal with the eco-friendly vehicle in Bristol on March 17, 2015. Powered by biomethane gas, the Bio-Bus will use waste from more than 32,000 households along its 15-mile route. Operated by bus company First West of England, the bus will fill up at a site in Avonmouth, Bristol, where sewage and inedible food waste is turned into biomethane gas. (Photo by Ben Birchall/PA Wire)

A therapy Pomeranian dog is pulled along during the 133rd Atlanta St. Patrick's Parade in Atlanta, Georgia, USA, 14 March 2015. The parade dates back to 1858, one of the oldest in the United States. Saint Patrick's Day celebrates Ireland's patron saint on the anniversary of his death, 17 March, in the fifth century. (Photo by Erik S. Lesser/EPA)

A handout picture provided by Solar Impulse on 18 March 2015 shows the Swiss solar-powered plane Solar Impulse 2, HB-SIB, taking off with Swiss explorer Andre Borshberg on board for the third leg Ahmedabad to Varanasi, of the Round-The-World, in Ahmedabad, India, 18 March 2015. Swiss explorers Bertrand Piccard and Andre Borschberg attempt to circumnavigate the world flying with an aircraft, with a 72 metres wingspan, powered only by solar energy without a drop of fuel. (Photo by EPA/Solar Impulse)

Paralympic athlete Sayaka Murakami (L) and Paralympic snowboarder Mika Abe (R) chat as they wait backstage to take part in a fashion show for the “tenbo” brand, designed by Japanese designer Takafumi Tsuruta, during the Tokyo Fashion Week's 2015-16 autumn/winter collection in Tokyo on March 18, 2015. Tsuruta designed the line of outfits for all people, including those with disabilities, using items such as magnetic buttons for users to put and take off clothes easily. (Photo by Yoshikazu Tsuno/AFP Photo)

UAE Air Force aerobatic display team perform at Langkawi International Maritime and Aerospace Exhibition in Langkawi, Malaysia, on Wednesday, March 18, 2015. (Photo by Vincent Thian/AP Photo)

Gift Horse, the latest work of art to take its place on Trafalgar Square's Fourth Plinth, is pictured high above The National Gallery on March 5, 2015 in London, England. The sculpture, by 78-year old German artist Hans Haacke, is the skeleton of a riderless horse with a London Stock Exchange ticker attached to its leg, intended to represent the effects of the City, power and money. (Photo by Mary Turner/Getty Images)

Cosplayer posing at the Leipzig Book Fair on March 13, 2015 in Leipzig, Germany. From March 12 to 15 more than 2000 exhibitors present their products of the publishing and media sector. (Photo by Sebastian Willnow/Getty Images)

“Cosplay” fans pose for a photo as they attend the Leipzig Book Fair on March 14, 2015. The Leipzig book fair hosts 2,263 exhibitors from 42 countries and will take place till March 15, 2015. (Photo by Jan Woitas/AFP Photo/DPA)

A visitor in a costume of fictional superhero Spiderman takes pictures during the Leipzig Book Fair on March 14, 2015. (Photo by Hendrik Schmidt/AFP Photo/DPA)

A sculpture of the head of Assyrian King Sargon II is on display during a ceremony to repatriate Iraqi cultural items that were smuggled into the United States, March 16, 2015 in Washington, DC. More than 60 cultural treasures were returned to the Republic of Iraq following investigations by the US Immigration and Customs Enforcement and the Department of Homeland Security. (Photo by Mark Wilson/Getty Images)

An archaeologist from the Museum of London works on the Bedlam burial ground where it is believed over 20,000 Londoners were buried between 1569 and 1738, on March 17, 2015 in London, England. The excavation is part of the ongoing Crossrail construction works to facilitate an entrance to the new Liverpool Street Crossrail ticket station. (Photo by Carl Court/Getty Images)

Soldiers of the honor guard prepare to march as people celebrate the first anniversary of the signing of the decree on the annexation of the Crimea by the Russian Federation, on March 18, 2015 in Sevastopol, Crimea. Crimea, an internationally recognised Ukrainian territory with special status, was annexed by the Russian Federation on March 18, 2014. The annexation, which has been widely condemned, took place in the aftermath of the Ukranian revolution. (Photo by Alexander Aksakov/Getty Images)

Performers dance during the Cherry Blossom Festival at Gucun Park on March 18, 2015 in Shanghai, China. Cherry Blossom Festival opened at Gucun Park in Shanghai and is open till April 15. (Photo by ChinaFotoPress/ChinaFotoPress via Getty Images)

A demonstrator holds a flag of the self-proclaimed Donetsk People's Republic as he is carried by fellow activists dressed as zombies shouting mock slogans “We like Russian TV, we like Putin” during a protest outside the Ukrainian parliament in Kiev demanding a law banning Russian television programmes which they consider to be propaganda on March 17, 2015. (Photo by Sergei Supinsky/AFP Photo)

In this March 16, 2015 photo, a tourist from Hong Kong poses for her souvenir photo in front of Line’s character Brown bear at the Line Friends flagship shop in Seoul, South Korea. For smartphone users in Asia where most of Line’s 181 million monthly users are located, the characters are as familiar as Hello Kitty or Disney’s animated stars. They are not well known in America or Europe but owner Line Corp. hopes to change that. It plans to open 100 stores selling Brown dolls and other cute “Line Friends” paraphernalia worldwide over the next three years as a way to draw more users to the app. (Photo by Lee Jin-man/AP Photo)

People watch an All Nippon Airways' plane approach the Narita International Airport from a popular viewing spot at Sakuranoyama Park in Narita, east of Tokyo, March 14, 2015. (Photo by Koji Sasahara/AP Photo)

Spring Breakers are covered in foam at The City nightclub in the Caribbean resort city of Cancun, Mexico, early Monday, March 16, 2015. Cancun continues to be one of the top foreign destinations for U.S. college students to spend Spring Break. (Photo by Israel Leal/AP Photo)

A rocket propelled launcher hangs on the mirror of a camouflaged Chadian pickup truck in the Nigerian city of Damasak, Nigeria, Wednesday, March 18, 2015. Damasak was flushed of Boko Haram militants last week, and is now controlled by a joint Chadian and Nigerien force. (Photo by Jerome Delay/AP Photo)

Tourists and visitors from the Bardo museum are evacuated in Tunis, Wednesday, March 18, 2015 in Tunis, Tunisia. Gunmen opened fire at a leading museum in Tunisia's capital, killing 19 people including 17 tourists, the Tunisian Prime Minister said. A later raid by security forces left two gunmen and one security officer dead but ended the standoff, Tunisian authorities said. (Photo by Hassene Dridi/AP Photo)

Police officers are seen on the pavement outside parliament in Tunis March 18, 2015. Gunmen attacked Tunisia's national museum near its parliament on Wednesday, killing at least seven tourists and taking others hostage inside the building, the government said. (Photo by Zoubeir Souissi/Reuters)

Asa Meslar swims along the Rock Springs Run at Kelly Park in Apopka, Fla., on Tuesday, March 10, 2015. Rock Springs is a natural free flowing spring which has an average flow of 26,000 gallons of fresh water per minute and maintains a constant temperature of 68 degrees. (Photo by John Raoux/AP Photo)

Kevin Hill of Canada is in action during the semi-final race of the men's snowboard cross World Cup, in Veysonnaz, Switzerland, Saturday, March 14, 2015. (Photo by Jean-Christophe Bott/AP Photo/Keystone)

A demonstrator, dressed in Soviet-era military uniform, sings, on his way to a concert marking the one year anniversary of annexation of Ukraine's Crimea peninsula, in downtown Moscow, Russia, Wednesday, March 18, 2015. A poster in the background shows a portrait of Russian President Vladimir Putin and reads “Putin Sows Kindness in the World”. (Photo by Denis Tyrin/AP Photo)

In this March 16, 2015 photo, figures of Cony the bunny, one of Line's characters, are displayed at the Line Friends flagship shop in Seoul, South Korea. For smartphone users in Asia where most of Line's 181 million monthly users are located, the characters are as familiar as Hello Kitty or Disney's animated stars. They are not well known in America or Europe but owner Line Corp. hopes to change that. It plans to open 100 stores selling Brown dolls and other cute “Line Friends” paraphernalia worldwide over the next three years as a way to draw more users to the app. (Photo by Lee Jin-man/AP Photo)

Bathers (L-R) Fanny Caritte, Milena Georgeault and Maxime Goyou Beauchamps of France show off their frozen hair while bathing in a 40 degree Celsius (104 Fahrenheit) pool in air temperatures of -30 C (-22 F) at Takhini Hot Springs in Whitehorse, Yukon in this handout photo taken February 9, 2015. The hot springs announced on March 2 that the group had won the hot springs' 2015 International Hair Freezing Contest. (Photo by Fanny Caritte/Reuters)

Singer Mans Zelmerlow celebrating the victory in the Swedish Melody Grad Prix. Zelmerlow will represent Sweden with the song “Heroes” in the Eurovision Song contest in Vienna in May. (Photo by Maja Suslin/AP Photo/TT)

Mongolian yokozuna Hakuho takes down ozeki Goeido with an overarm throw at the Spring Grand Sumo Tournament in Osaka on March 18, 2015, improving to 11-0 in the 15-day meet. (Photo by Kyodo via AP Images)

A woman poses for a wedding picture at the Bund in front of the financial district of Pudong in Shanghai on a sunny day on March 19, 2015. (Photo by Johannes Eisele/AFP Photo)

People take pictures of an eruption of the Turrialba volcano, from San Gerardo de Irazu near Turrialba, March 13, 2015. Costa Rica's Turrialba volcano belched a column of gas and ash up to 3,280 feet (1 km) into the air on Thursday in its most powerful eruption in two decades, and local authorities started to evacuate residents from the surrounding area. (Photo by Juan Carlos Ulate/Reuters)

Friskies' “official spokescat” Grumpy Cat takes time to frown with fans at the first-ever “Haus of Bacon” during the popular Austin-based festival on Sunday, March 15, 2015 in Austin, TX. Thanks to fan support through use of the hashtag #CatDreamsComeTrue, Friskies® donated 50,000 meals of the NEW Tasty Treasures® Accented with Real Bacon to shelter cats. (Photo by Erich Schlegel/AP Images for Friskies)

Actors film a zombie-themed promo in front of the Capitol, Tuesday, March 17, 2015, in Olympia, Wash. They were among more than 200 cast and crew members from various productions who came to the Capitol in support of a measure to expand tax incentives for film and TV production in Washington state. (Photo by Rachel La Corte/AP Photo)

Drummers from the Gishora drumming group perform in Gishora on March 14, 2015. The group's leader, Anthime Baranshakaje used to perform for Burundi's King Mwambutsa. The tradtion is being kept alive as the group now perform internationally and for dignitaries and Burundi's President. Burundi's royal drum was late last year given Intangible Cultural Heritage staus by the United Nations Educational, Scientific and Cultural Organization (UNESCO). (Photo by Carl de Souza/AFP Photo)

Finnish sand sculptor Pasi Ahokas carves the "Gollum" character from the movie “Lord of the Rings” as preparations are under way for a sand sculpture festival in Binz on the Baltic island of Ruegen, northeastern Germany, on March 17, 2015. Carvers from all over the World create sculptures from 16,000 tons of special sand for the festival themed “TV and Movie”. The festival starts on March 21, 2015. (Photo by Stefan Sauer/AFP Photo/DPA)