Football – Real Madrid vs Atletico Madrid – UEFA Champions League Quarter Final Second Leg – Estadio Santiago Bernabeu, Madrid, Spain, on April 22, 2015. Javier Hernandez celebrates after scoring the first goal for Real Madrid. (Photo by Juan Medina/Reuters)

Juventus players celebrate after their team's qualification for the semi-final of the Champions League at the end of their quarter-final second leg soccer match against Monaco at the Louis II stadium in Monaco April 22, 2015. (Photo by Jean-Paul Pelissier/Reuters)

Noelani Pantastico of The Monte Carlo Ballet performs Prokofiev's Romeo and Juliet for its London premiere, choreographed by Jean-Christophe Maillot at the London Coliseum April 22, 2015. (Photo by Eddie Keogh/Reuters)

A view of over 800 school children, teachers and volunteers forming the shape of a fish with a sad expression, alongside Chinese characters that read “refrain”, at Repulse Bay in Hong Kong April 23, 2015. The event was in honor of Kids Ocean Day, to send a global message to stop consuming reef fish in order to protect the earth's coral reefs, according to the organiser. The image was originally drawn by a local seven-year-old student. (Photo by Bobby Yip/Reuters)

A pilot (R) and other people move a G 120TP aircraft, after the inauguration of the first Aerospace Fair 2015 at the Santa Lucsia military airbase in Tecamac near Mexico City April 22, 2015. Mexico's biggest gathering in aerospace technology kicked off on Wednesday with a demonstration of state-of-the-art aircraft from Mexico and abroad as the Latin American country emerges as a promising young player in the aviation industry. (Photo by Henry Romero/Reuters)

A trained sea lion writes the Chinese character “yang”, which means “goat” or “sheep”, on a board held by its trainer during a performance at the Beijing Aquarium, in Beijing, April 23, 2015. (Photo by Reuters/Stringer)

A tree is pictured in a blooming rapeseed field on a spring morning in Vufflens-la-Ville near Lausanne April 23, 2015. (Photo by Denis Balibouse/Reuters)

Sepak Takraw – ISTAF Super Series Korea 2014-15 – Gunsan City, South Korea, on April 23, 2015: Malaysia against Myanmar during their men's group stage match. (Photo by Vivek Prakash/Reuters/Action Images)

Sepak Takraw – ISTAF Super Series Korea 2014-15 – Gunsan City, South Korea, on April 23, 2015: South Korea's Park Seon Ju in action. (Photo by Jeremy Lee/Reuters/Action Images)

Sepak Takraw – ISTAF Super Series Korea 2014-15 – Gunsan City, South Korea, on April 23, 2015: South Korea's Park Seon Ju (C) in action with Malaysia's Elly Syahira Rosli (R) during the Group A match. (Photo by Vivek Prakash/Reuters/Action Images)

A paramilitary soldier throws a liquor bottle near a burning pile of confiscated narcotics in Shahkas area of Pakistan's Khyber Agency April 23, 2015. Narcotics including 72000 kg of hashish, 110 kg of heroin, 179 kg of opium and 950 bottles of liquor were burned and destroyed, according to paramilitary narcotics officials. (Photo by Fayaz Aziz/Reuters)

Women wearing masks depicting Britain's Queen Elizabeth and Catherine, Duchess of Cambridge take part in a Saint George's Day parade in Nottingham, central England, April 23, 2015. (Photo by Darren Staples/Reuters)

A woman with a push chair walks past a piece of street art depicting a pregnant Catherine, Duchess of Cambridge, in north London, April 23, 2015. The Duchess is due to give birth to her second child in the next few days. (Photo by Cathal McNaughton/Reuters)

The Navy's unmanned X-47B aircraft receives fuel from an Omega K-707 tanker plane while operating in the Atlantic Test Ranges over the Chesapeake Bay, Maryland April 22, 2015. This test marked the first time an unmanned aircraft refueled in flight. (Photo by Liz Wolter/Reuters/U.S. Navy)

The Navy's unmanned X-47B aircraft receives fuel from an Omega K-707 tanker plane (not shown) while operating in the Atlantic Test Ranges over the Chesapeake Bay, Maryland April 22, 2015. (Photo by Liz Wolter/Reuters/U.S. Navy)

A mammoth tusk is pictured by a river on the Taimyr Peninsula in Siberia in this image released to Reuters on April 22, 2015. The most complete genetic information assembled on woolly mammoths is providing insight into their demise, revealing they suffered two population crashes before a final, severely inbred group succumbed on an Arctic Ocean island. Scientists unveiled on April 23, 2015 the first two full genomes of these mighty elephant relatives emblematic of the Ice Age, showing they experienced an extensive loss of genetic diversity before perishing roughly 4,000 years ago. (Photo by Love Dalen/Reuters)

A prototype of a solar car built by students at the El Alto public university, is seen during a test in El Alto April 23, 2015. Students of mechanical and electronic systems, technology school, built the solar car for a contest sponsored by the Bolivian government. (Photo by David Mercado/Reuters)

Yellowstone National Park’s Grand Prismatic hot spring is pictured in this undated handout photo obtained by Reuters April 23, 2015. The hot springs are among the park’s hydrothermal features created by the fact that Yellowstone is a supervolcano – the largest type of volcano on Earth. A new University of Utah study reports discovery of a huge magma reservoir beneath Yellowstone’s previously known magma chamber. That doesn’t increase the risk of an eruption, but means scientists are getting a better view of Yellowstone’s volcanic plumbing system. (Photo by Robert B. Smith/Lee J. Siegel/Reuters)

Members of the Armenian community attend a memorial march marking the 100th anniversary of the mass killings of 1.5 million Armenians by Ottoman Turkish forces in Jerusalem's Old City April 23, 2015. Armenia say the massacres during World War One constitute genocide – a term used this month by Pope Francis. Muslim Turkey accepts many Christian Armenians were killed in partisan fighting during the war, but denies it amounted to genocide. (Photo by Ronen Zvulun/Reuters)

Members of the Oath Keepers provide security at the Sugar Pine Mine outside Grants Pass, Oregon April 22, 2015. The owners of the Oregon gold mine who called in armed activists the Oath Keepers to protect their claim amid a bitter land use dispute with the U.S. government have appealed a federal stop-work order, U.S. officials said on Thursday. (Photo by Jim Urquhart/Reuters)

An attendee photographs chairs on a patio during the opening preview of The Whitney Museum of American Art in New York April 23, 2015. American art gets a new home as the Whitney Museum of American Art opens the doors to its new location in New York. (Photo by Brendan McDermid/Reuters)

An art piece by Czech Republic artist Richard Stipl is exhibited during the international PARC 2015 art fair in Lima April 23, 2015. PARC 2015 is an art fair drawn from the collections in 42 art galleries and displays works in contemporary photography, video and installation art from around the world, according to local media. (Photo by Mariana Bazo/Reuters)

Volunteers walk with a tiger on leash during a head count at the Wat Pa Luang Ta Bua, otherwise known as the Tiger Temple, in Kanchanaburi province, Thailand, April 24, 2015. Thai officials from the Department of Wildlife and National Parks on Friday inspected microchips in the tigers held captivity at the popular Tiger Temple, home to more than 100 tigers, to update their database. (Photo by Athit Perawongmetha/Reuters)

An official scans a microchip on a tiger during a head count at the Wat Pa Luang Ta Bua, otherwise known as the Tiger Temple, in Kanchanaburi province, Thailand, April 24, 2015. (Photo by Athit Perawongmetha/Reuters)

A volunteer plays with a tiger during a head count at the Wat Pa Luang Ta Bua, otherwise known as the Tiger Temple, in Kanchanaburi province, Thailand, April 24, 2015. (Photo by Athit Perawongmetha/Reuters)

A tourist tries out to leash a tiger led by a Buddhist monk, left, at the “Tiger Temple” in Saiyok district in Kanchanaburi province, west of Bangkok, Thailand, Friday, April 24, 2015. Officials from the Department of National Parks, Wildlife and Plant Conservation on Friday visited the temple to inspect the number of the tigers, in response to allegations that the animals went missing. (Photo by Sakchai Lalit/AP Photo)

Two tigers play at the Tiger Temple in Kanchanaburi province on April 24, 2015. Thai wildlife officials began a headcount of nearly 150 tigers kept by monks at a controversial temple which has become the centre of a dispute over the welfare of the animals. (Photo by Nicolas Asfouri/AFP Photo)

A member of a historical military club in World War Two uniform holds her dog in front of the U.S. embassy in Prague April 24, 2015. The traditional Convoy of Liberty commemorates the 70th anniversary of the liberation of the western part of the country from Nazi rule by the U.S. Army. (Photo by David W. Cerny/Reuters)

People greet members of historical military clubs in World War Two uniforms in front of the U.S. embassy in Prague April 24, 2015. (Photo by David W. Cerny/Reuters)

Members of historical military clubs in World War Two uniforms are welcomed in front of the U.S. embassy in Prague April 24, 2015. (Photo by David W. Cerny/Reuters)

Cars drive past a giant metal statue of a bison in a field near the village of Dudichi, southwest of Minsk, April 24, 2015. European bison, a national symbol of Belarus, is the largest wild animal in the country. (Photo by Vasily Fedosenko/Reuters)

People look at a dummy of a seamaid which is on display near a street fish market in central Moscow, April 24, 2015. (Photo by Sergei Karpukhin/Reuters)

A man transports empty containers to sell on his bicycle in Sanaa, April 24, 2015. (Photo by Mohamed al-Sayaghi/Reuters)

English teacher Laura Thomas, who is a British citizen, poses for a picture near a traditional Matryoshka doll made of used tyres near her campus on a day off in the town of Lesosibirsk, north of the Russian Siberian city of Krasnoyarsk, April 23, 2015. Thomas, 25, a graduate of the University of Cambridge, developed an interest in the Russian language and culture as a teenager, and left her native town of Congleton, Cheshire in Britain for Lesosibirsk seven months ago to educate Russian trainee teachers in the English language at a local educational institute, a branch of the Siberian Federal University. Thomas has since experienced her first severe Siberian winter and has already made new acquaintances among the local residents. She plans to live and work in the region for at least several years to come. (Photo by Ilya Naymushin/Reuters)

Nepal's Kumari, or living goddess, adjusts her ornament as she watches the Rato Machindranath chariot Festival in Lalitpur, Nepal, Friday, April 24, 2015. Nepal's living goddesses are young pre-pubescent girls considered by devotees to be incarnations of a Hindu goddess. Selected as toddlers, living goddesses usually keep their positions until they reach puberty. (Photo by Niranjan Shrestha/AP Photo)

Bungamati village is pictured in the background as devotees sit on top of the chariot of Rato Machhindranath at Bungamati in Lalitpur, Nepal April 24, 2015. Rato Machhindranath is known as the god of rain and both Hindus and Buddhists worship Machhindranath for good rain to prevent drought during the rice harvest season. (Photo by Navesh Chitrakar/Reuters)

Spanish matador Jose Maria Manzanares drives a sword into a bull to kill it during a bullfight at The Maestranza bullring in the Andalusian capital of Seville, southern Spain April 24, 2015. (Photo by Marcelo del Pozo/Reuters)

Spanish matador David Galvan is tackled by a bull during a bullfight at The Maestranza bullring in the Andalusian capital of Seville, southern Spain April 24, 2015. (Photo by Marcelo del Pozo/Reuters)

John Voracek sits on a chair in the Mediterranean sea as he waits for Israeli Air Force planes to fly, during Israel's 67th Independence Day, in Tel Aviv, Israel, Thursday, April 23, 2015. Israel is celebrating its annual Independence Day, marking 67 years since the founding of the state in 1948. (AP Photo/Ariel Schalit)

Boxers Wladimir Klitschko, left, and Cecilia Braekhus pose for pictures with their title belts during a news conference in New York, Tuesday, April 21, 2015. (Photo by Seth Wenig/AP Photo)

People fly their kites to form the shape of a car in the sky on the beach in Berck, northern France, on April 20, 2015, during the 29th “Rencontres Internationales de Cerfs Volants” (International Kite Meeting) which runs from April 18 to 26. (Photo by Philippe Huguen/AFP Photo)

A giant, hedgehog-shaped kite flies on the beach in Berck, northern France, on April 20, 2015, during the 29th “Rencontres Internationales de Cerfs Volants” (International Kite Meeting) which runs from April 18 to 26. (Photo by Philippe Huguen/AFP Photo)

People fly their kites to form the shape of a stick figure in the sky on the beach in Berck, northern France, on April 20, 2015, during the 29th “Rencontres Internationales de Cerfs Volants” (International Kite Meeting) which runs from April 18 to 26. (Photo by Philippe Huguen/AFP Photo)

Tourists take pictures of a floral arrangement depicting Dutch master Vincent van Gogh at Keukenhof, a spring park with approximately seven million flower bulbs, in Lisse, Netherlands, Tuesday, April 21, 2015. (Photo by Peter Dejong/AP Photo)

In this April 13, 2015 photo, Silpa Dhungel, a 23-year-old college student who is blind, participates with other blind women in a self-defense course in Kathmandu, Nepal. The free self-defense course offered for blind women by Paritran, a local security agency is the first such initiative in the Himalayan nation. Women's security has become a major issue in this Himalayan nation over the past couple years, spillover from a deadly 2012 gang-rape on a New Delhi bus that was closely followed here. (Photo by Niranjan Shrestha/AP Photo)

A Malaysian couple poses for pictures amid a forest of LED lights at an amusement park in Kuala Lumpur on April 21, 2015. (Photo by Manan Vatsyayana/AFP Photo)

South Africans break the Guinness World record for the World's Largest Blanket at the Union Buildings on April 21, 2015 in Pretoria, South Africa. The handmade blanket was created by thousands of people across the globe who each knitted small portions. The idea for the blanket came in 2013 when Nelson Mandela's assistant, Zelda La Grange, who gave the organiser' Carolyn Steyn' a challenge to knit 67 blankets for Mandela Day. This blanket measured over 3000 meters squared. The blankets will be distributed to the needy on Mandela Day. (Photo by Greatstock/Barcroft Media)

A man looks at a Soviet poster, dated 1945, that reads “The enemy is cunning – be on guard!”, part of the exhibition “1945 – Defeat. Liberation. New Beginning” at the German Historical Museum in Berlin, Germany, 22 April 2015. The exhibition runs from 24 April until 25 October 2015. (Photo by Gregor Fischer/EPA)

Filipino graphic artist and barista Zach Yonzon, draws the faces of Filipino boxer Manny Pacquiao and American boxer Floyd Mayweather Junior on two coffee latte inside a Cafe and Cake Studio in Manila, Philippines, 23 April 2015. Yonzon draws different faces on the top of a coffee latte upon costumers' requests. (Photo by Ritchie B. Tongo/EPA)

A man takes photos of sculptures that are part of the exhibition “Human” by British artist Antony Gormley at Forte di Belvedere in Florence, Italy, 24 April 2015. More than 100 scultures will be on display from 26 April to 27 September. (Photo by Maurizio Degl'innocenti/EPA)

Bollywood actors Varun Dhawan, right, and Shraddha Kapoor perform during the trailer unveiling of ABCD 2 (Any Body Can Dance 2) in Mumbai, India, Wednesday, April 22, 2015. The movie is scheduled for release on June 19, 2015. (Photo by Rafiq Maqbool/AP Photo)

Nearly one thousand girls between 14 and 24 years old wearing traditional clothing receive coming-of-age ceremony on April 21, 2015 in Huaihua, Hunan province of China. The traditional Shangsi festival, also known as March 3 Festival, fell on the third day of the third month each year, according to Chinese lunar calendar and It was a festival to ward off misfortunes and pray for blessings in ancient China. (Photo by ChinaFotoPress/Getty Images)