Artists perform in central Saint Petersburg on April 1, 2015 to mark April Fools' Day. (Photo by Olga Maltseva/AFP Photo)

Actors of the clown-mime theater “Mimigranty” celebrate the Humor Day in central St. Petersburg, Russia, 01 April 2015. (Photo by Anatoly Maltsev/EPA)

People watch the PSLV-C27 take off carrying India's fourth navigational satellite, in Sriharikota, India, Saturday, March 28, 2015. Indian Space Research Organisation's Polar Satellite Launch Vehicle-C27 successfully lifted off from the Sriharikotta rocket port carrying IRNSS-1D, the fourth satellite of the Indian Regional Navigation Satellite System (IRNSS) that will provide navigation, tracking and mapping services. (Photo by Arun Sankar K./AP Photo)

A girl who didn't enter the fair stands outside the entrance for few minutes before leaving, in El Crucero, Nicaragua, Sunday, March 30, 2015. The town holds a fair once a year to celebrate its founding. (Photo by Esteban Felix/AP Photo)

Matt Crafton (88) hits the bumper of Cole Custer (00) in turn four during the NASCAR truck race at the Martinsville Speedway in Martinsville, Va., Saturday, March 28, 2015. (Photo by Steve Sheppard/AP Photo)

Shepherds dressed in sheepskin blow brass horns in Bucharest, Romania, Thursday, April 2, 2015. Romanian sheep and cattle farmers complained about underfunded and delayed subsidies and the elimination of milk subsidies that would allow cheaper imports and in turn would lead to the closure of 60 percent of farms, during a protest that took place in front of the Romanian government headquarters. (Photo by Andreea Alexandru/AP Photo/Mediafax)

A man installs shark-shaped balloons enclosed in a plastic globe in a water fountain in Nice on April 1, 2015. (Photo by Valery Hache/AFP Photo)

British pastry cook Michael Lewis-Anderson holds a sixty-kilogram giant chocolate egg with candied orange peel in the form of an artichoke at a Wittamer chocolate boutique ahead of the Easter weekend in Brussels April 3, 2015. (Photo by Francois Lenoir/Reuters)

British pastry cook Michael Lewis-Anderson displays an egg shell filled with praline chocolate and sugar at a Wittamer chocolate boutique for Easter weekend in Brussels, Belgium April 3, 2015. (Photo by Francois Lenoir/Reuters)

A worker adjusts bulbs as they hang lanterns, for upcoming celebration of Buddha's birthday on May 25 at Jogye temple in Seoul, South Korea, Thursday, April 2, 2015. (Photo by Lee Jin-man/AP Photo)

A masked penitent prepares to take part in the procession of the “Silencio del Santisimo Cristo del Rebate” brotherhood, during Holy Week in Tarazona, northern Spain, Tuesday, March 31, 2015. Hundreds of processions take place throughout Spain during the Easter Holy Week. (Photo by Alvaro Barrientos/AP Photo)

A woman devotee in trance with her tongue pierced with a metal rod, is helped by men on her way to a temple of Lord Murugan, on the occasion of Panguni Uthiram festival, in Ahmadabad, India Friday, April 3, 2015. One of the most important festival of southern India, which is observed in the Tamil month of Panguni. The festival is celebrated in honor of the Hindu God Murugan where devotees make offerings to lord Murugan with sacrificial feats they believe will keep them away from evil spirits. (Photo by Ajit Solanki/AP Photo)

A woman from the Hausa tribe, with a red mark on her thumbnail indicating she has already validated her voting card, looks at her smartphone while she waits for friends to finish the process, at a polling station located in an Islamic school in Daura, the home town of opposition candidate Gen. Muhammadu Buhari, in northern Nigeria Saturday, March 28, 2015. (Photo by Ben Curtis/AP Photo)

This handout photo provided by Carnegie Mellon University, taken in March 2015, shows an exoskeleton boot on a person walking in a park in Pittsburgh. Engineers at Carnegie Mellon University have developed an exoskeleton boot that makes it easier to walk, burning less calories. When engineers tested the invention they did so by having people wear a pair of the devices, not one. (Photo by Lisa Lau/AP Photo/Carnegie Mellon University)

This image taken Tuesday March 31, 2015 shows Typhoon Maysak taken by astronaut Samantha Cristoforetti from the International Space Station. The Pacific Daily News newspaper in Guam reports the storm was upgraded Tuesday to a super typhoon with winds of 150 mph and was moving west-northwest at 15 mph. Officials say super Typhoon Maysak is expected to significantly weaken before reaching the Philippines around Sunday. (Photo by Samantha Cristoforetti/AP Photo/NASA)

A picture made available on 02 April 2015 shows a close up of Super Typhoon Maysak's eye taken from the International Space Station (ISS), in space, 01 April 2015. The State weather bureau issued the alert for Typhoon Maysak as it enters towards the country ahead of Easter holidays. The public has been alerted against possible flashfloods over low-lying areas and landslides along mountain slopes. Thousands of tourists at surfing destination in the town of Baler, Aurora province are advised to vacate resorts near the coastline. (Photo by Terry Virts/EPA/NASA)

An Iranian woman walks in a street of Tehran, Iran, April 1, 2015. Senior diplomats from Iran and six world powers resumed their work on 01 April to finish a preliminary agreement to end international concerns about Tehran's nuclear programme. The negotiations were extended beyond the self-imposed March 31 deadline. Iran and the group of Britain, China, France, Russia, the United States and Germany aim to agree on the key elements of a deal that would scale down Tehran's civilian nuclear activities for some 10 years. (Photo by Abedin Taherkenareh/EPA)

An Assyrian Christian girl, background, holds a candle as she looks at a woman kissing the cross during Mass marking the traditional Palm Sunday procession at the Assyrian church in east of Beirut, Lebanon, Sunday, March 29, 2015. Streams of Christians gathered Sunday to celebrate the path of Jesus Christ's last journey into Jerusalem, when his followers laid palm branches in his path, before his crucifixion. (Photo by Hussein Malla/AP Photo)

Artist Arturo Damasco paints a 40-square meters mural of Mexican singer Alberto Aguilera Valadez, better known as Juan Gabriel, in downtown Ciudad Juarez March 27, 2015. The mural is part of a government programme aimed to renew the historic center to attract tourism after years of drug violence, and to honor one of the main icons of the city, local media reported. (Photo by Jose Luis Gonzalez/Reuters)

A Palestinian woman reacts to sound of grenades fired by Israeli troops during clashes following a protest marking the Land Day and against Jewish settlements in the West Bank village of Silwad near Ramallah March 30, 2015. Palestinians mark Land Day on March 30, the annual commemoration of protests in 1976 against Israel's appropriation of Arab-owned land in the Galilee. (Photo by Mohamad Torokman/Reuters)

An half closed window is seen on a house painted with graffiti in a Rome neighbourhood, March 30, 2015. (Photo by Stefano Rellandini/Reuters)

Lesbian activists Hiroko Masuhara (centre L) and her partner Koyuki Higashi (centre R) speak to the media with transgender activist Fumino Sugiyama (L) and gay activist Gon Matsunaka after Tokyo's Shibuya ward recognises same-s*x partnerships, outside the Shibuya city hall in Tokyo in this photo taken by Kyodo March 31, 2015. A district assembly in Tokyo became the first in Japan on Tuesday to recognise same-s*x partnerships, a major step forward for gay couples in a country where being openly gay remains taboo. (Photo by Reuters/Kyodo News)

A woman takes advantage of warm spring weather temperatures on the beach in Nice March 31, 2015. (Photo by Eric Gaillard/Reuters)

An actor portraying the crucified Jesus Christ takes part in the interactive street-theatre performance of Il-Mixja (The Way) in Attard, outside Valletta, March 31, 2015. The Passion play was held in the grounds of Mount Carmel Mental Hospital as part of a series of Holy Week activities in the run-up to Easter taking place all over Malta. (Photo by Darrin Zammit Lupi/Reuters)

A worker stands next to an installation made of plastic bottles in Tegucigalpa March 31, 2015. The Museum of National Identity is working on installations made from recycled plastic bottles as a way to encourage recycling in the community, local media reported. (Photo by Jorge Cabrera/Reuters)

A man whose livelihood depends on selling recyclable wastes collects trash from a dumping site as he surrounded by Marabou storks on the outskirt of Uganda's capital Kampala March 31, 2015. (Photo by James Akena/Reuters)

A woman whose livelihood depends on selling recyclable wastes collects trash from a dumping site while surrounded by Marabou storks on the outskirts of Uganda's capital Kampala March 31, 2015. (Photo by James Akena/Reuters)

A supporter holds posters of leader of the Sudanese Socialist Democratic Union and presidential candidate Fatima Abdel Mahmoud during her election campaign ahead of the 2015 election, in Khartoum March 31, 2015. (Photo by Mohamed Nureldin Abdallah/Reuters)

Lufthansa Chief Executive Carsten Spohr (L) and Germanwings Managing Director Thomas Winkelmann carry flowers as they pay their respects at the memorial for the victims of the air disaster in the village of Le Vernet, near the crash site of the Germanwings Airbus A320 in French Alps April 1, 2015. Lufthansa said on Wednesday it will take a long while to establish the events that led to the Germanwings plane crash last week, killing the 150 people who were on board. (Photo by Jean-Paul Pelissier/Reuters)

Russian journalists play a game of giant chess in a courtyard at the Beau Rivage Palace Hotel in Lausanne, April 1, 2015. Iran hopes to conclude talks with six major powers on a preliminary accord on reining in its nuclear programme by Wednesday night, its senior nuclear negotiator said. (Photo by Brendan Smialowski/Reuters)

A member of the jury poses with the winner of a beauty contest for pigs in a farm in Hajmas, south-west Hungary March 31, 2015. The contest, held a day ahead of April 1, was organized to mark April Fools' Day. Picture taken March 31, 2015. (Photo by Laszlo Balogh/Reuters)

A member of the jury poses with the winner of a beauty contest held for pigs in a farm in Hajmas, south-west Hungary, March 31,2015. (Photo by Laszlo Balogh/Reuters)

Ron Clarke, a professor in the Evolutionary Studies Institute at Wits University in South Africa holds the Little Foot skull in this undated handout photo obtained by Reuters April 1, 2015. The Little Foot skeleton – a rare, nearly complete skeleton of Australopithecus discovered in a cave central South Africa – is among the oldest hominid skeletons ever dated at 3.67 million years old, according to an advanced dating method. The date places Little Foot as an older relative of Lucy, a famous Australopithecus skeleton dated at 3.2 million years old that was found in Ethiopia. (Photo by Reuters/Wits University)

The body of an unidentified armed woman lies on the ground near Istanbul's police headquarters April 1, 2015. Turkish police shot dead the woman carrying guns and hand grenades and detained a man as they tried to attack Istanbul's police headquarters on Wednesday, officials and media said, the third attack on an official building in the past two days. A photograph published by local media showed a red-haired woman lying on the ground with a rifle strapped to her and a handgun by her side. Television footage showed police vehicles sealing off the street in the central Aksaray neighbourhood. (Photo by Reuters/Ihlas News Agency)

A Houthi fighter stands guard as he secures the site of a demonstration by fellow Houthis against the Saudi-led air strikes on Yemen, in Sanaa April 1, 2015. (Photo by Khaled Abdullah/Reuters)

A couple embrace each other while sitting in the pews of a cathedral in Guatemala City, April 1, 2015. (Photo by Jorge Dan Lopez/Reuters)

Supporters with painted bodies sit on a vehicle as they celebrate outside the office of the All Progressives Congress (APC) party after president-elect Muhammadu Buhari won the presidential election, along a street in the capital Abuja, April 1, 2015. (Photo by Akintunde Akinleye/Reuters)

A boy carries his belongings at a site hit by what activists said was a barrel bomb dropped by forces loyal to Syria's President Bashar al-Assad in Aleppo's al-Fardous district April 2, 2015. (Photo by Rami Zayat/Reuters)

Boys wave from a vehicle as they flee Sanaa with their family and belongings, fearing renewed air strikes, April 2, 2015. Yemen's Houthi fighters and their allies seized a central Aden district on Thursday striking a heavy blow against the Saudi-led coalition which has waged a week of air strikes to try to stem advances by the Iran-allied Shi'ite group. (Photo by Mohamed al-Sayaghi/Reuters)