Kinyare Bell, a kindergartener at Bethune Elementary School, wears butterfly wings as she and her classmates performe during a talent assembly Monday May 18, 2015 in Minneapolis, Minn. (Photo by Jerry Holt/The Star Tribune via AP Photo)

A Rohingya migrant child, who recently arrived in Indonesia by boat, cries as a volunteer cuts his hair inside a temporary compound for refugees in Aceh Timur regency, Indonesia's Aceh Province, May 22, 2015. (Photo by Reuters/Stringer)

In this file photo taken on Monday, January 12, 2015, an Iraqi girl from the Yazidi minority carries firewood on Mount Sinjar in northern Iraq. (Photo by Seivan Selim/AP Photo)

A Hezbollah supporter holds up a portrait of Hezbollah leader Sheikh Hassan Nasrallah as others wave Hezbollah and Lebanese flags during a rally commemorating “Liberation Day”, which marks the withdrawal of the Israeli army from southern Lebanon in 2000, in the southern town of Nabatiyeh, Lebanon, Sunday, May 24, 2015. (Photo by Mohammed Zaatari/AP Photo)

Shaven-headed children who entered temples to have an experience of monks' life for weeks, play Dongjasung (little monk) soccer at Jogye temple in Seoul, South Korea, Thursday, May 14, 2015. The Dongjasung soccer match is one of the events to celebrate Buddha's upcoming 2,559th birthday on May 25 and to publicize Korean Buddhism. (Photo by Lee Jin-man/AP Photo)

In this Wednesday, May 20, 2015 photo, Aseya, 3, poses for a photo in her family's room in at an orphanage that has been turned into a center for Yemeni refugees, in Obock, northern Djibouti. Fleeing the war at home, thousands of Yemenis have made it across the Gulf of Aden to find refuge in Djibouti, a sleepy Horn of Africa nation where the United Nations has set up a staging hub for aid for the conflict-torn Arab country. (Photo by Mosa'ab Elshamy/AP Photo)

A Palestinian boy shouts slogans as others wave flags after Friday prayers during a protest to mark Nakba day near the Dome of the Rock on the compound known to Muslims as Noble Sanctuary and to Jews as Temple Mount, in Jerusalem's Old City May 15, 2015. (Photo by Ammar Awad/Reuters)

Boys walk behind patrolling soldiers in Bujumbura, Burundi, May 15, 2015. (Photo by Goran Tomasevic/Reuters)

Joao Vitor, 7, looks next to demonstrators holding photographs of teens killed in shootings, as they protest against what they call police violence in Brazil, in downtown Sao Paulo May 15, 2015. (Photo by Nacho Doce/Reuters)

Pakistani Shi'ite supporters of Imamia Students Organisation (ISO) hold signs and chant slogans during anti-Israel and anti-U.S. rally to condemn the day marking the anniversary of the recognition and formation of Israel and the U.S. support for it, in Karachi, Pakistan, May 16, 2015. (Photo by Akhtar Soomro/Reuters)

Supporters of Venezuela's President Nicolas Maduro holding dolls of Venezuela's late President Hugo Chavez wave during the opening ceremony of a new avenue and inauguration of a public transportation route with Yutong brand buses in Los Teques, Venezuela May 16, 2015. (Photo by Marco Bello/Reuters)

A child dressed as Iron Man takes part in a charity run raising funds for the treatment of children with cancer at the children's hospital in Managua May 17, 2015. (Photo by Oswaldo Rivas/Reuters)

An Afghan girl plays with a rope on a hilltop in Kabul, Afghanistan May 18, 2015. (Photo by Mohammad Ismail/Reuters)

A girl bathes to cool off herself with water that is leaking from a broken pipe valve on a hot summer day on the outskirts of Ahmedabad, India, May 18, 2015. (Photo by Amit Dave/Reuters)

A Palestinian girl poses for a photograph outside her family's house, that witnesses said was damaged by Israeli shelling during a 50-day war last summer, in Beit Lahiya town in the northern Gaza Strip May 20, 2015. (Photo by Mohammed Salem/Reuters)

Children play in the fountains outside Central St Martins in London, Britain May 19, 2015. (Photo by Suzanne Plunkett/Reuters)

An altargirl participate in a procession for the late archbishop of San Salvador Oscar Arnulfo Romero during a procession in San Salvador May 22, 2015. (Photo by Jose Cabezas/Reuters)

A boy tries to hold a rifle while attending celebrations marking the 25th anniversary of Yemen's unification with his brother in Sanaa May 23, 2015. (Photo by Mohamed al-Sayaghi/Reuters)

Romanian children get help from their father as they pose with a machine-gun, standing next to an U.S. serviceman in Ploiesti, Romania, Wednesday, May 13, 2015. (Photo by Vadim Ghirda/AP Photo)

Young novice Buddhist monks wait to ride a roller coaster as they visit the Everland amusement park during their training program entitled “Children Becoming Buddhist Monks” in Yongin, south of Seoul, on May 21, 2015. (Photo by Jung Yeon-Je/AFP Photo)

A Rohingya migrant child stands in front a fan at a temporary shelter in Kuala Langsa, Aceh province, Indonesia, Sunday, May 24, 2015. Thousands of migrants – about half of them Bangladeshi and the others minority Rohingya Muslims from Myanmar – have landed ashore in Indonesia, Malaysia and Thailand since May 10. Thousands more are believed to be trapped at sea, and the United Nations has warned that time is running out. (Photo by Tatan Syuflana/AP Photo)

Yara, 5, and her brother Youssef, left, 16 months, hide inside a cardboard box as they play under a bridge while their mother sells tissue in Cairo, Egypt, Thursday, May 14, 2015. (Photo by Hassan Ammar/AP Photo)

A Syrian boy begs on the Istiklal street on a warm day as people walk in Istanbul, Turkey, 19 May 2015. (Photo by Sedat Suna/EPA)

Palestinian children play at the main road in Jebaliya refugee camp in the northern Gaza Strip, Thursday, May 14, 2015. (Photo by Adel Hana/AP Photo)

Iraqi students act a scene from a play titled “We are all against terrorism”, at a government primary school in Baghdad, Iraq, Tuesday, May 19, 2015. Children play the roles of government forces and militants from the Islamic State group. (Photo by Karim Kadim/AP Photo)

In this Monday, May 11, 2015 photo, Joani Londono, 5, who was born with a club foot and a missing leg, sits at her home in in Crucito, in Colombia's northwestern state of Cordoba. Joani's mother, Adevis Edith Diaz, claims the girl was born premature and she began to have pregnancy problems after she ate vegetables from a plot fumigated with chemicals from a plane. Research published last year by Daniel Mejia, an expert adviser to Colombian President Juan Manuel Santos on drug policy, found higher rates of skin problems and miscarriages in districts targeted by herbicides. It was based on a study of medical records from 2003 to 2007. (Photo by Fernando Vergara/AP Photo)

A young Rohingya boy looks on as he waits along with other illegal migrants at a temporary detention center in Langkawi on May 12, 2015. (Photo by Manan Vatsyayana/AFP Photo)