In this June 24, 2015 photo, schoolgirls walk through the rocky yard of Bethesda Evangelical School during a break in class, in Canaan, Haiti. (Photo by Rebecca Blackwell/AP Photo)

A Pakistani child takes a break during a class to learn the Quran at a mosque in Peshawar, Pakistan, Friday, July 3, 2015. Muslims across the world are observing the holy fasting month of Ramadan, where they refrain from eating, drinking and smoking from dawn to dusk. (Photo by Mohammad Sajjad/AP Photo)

A student walks back home after attending school as it rains at Reba Maheswar village, 56 kilometers (35 miles) east of Gauhati, India, Friday, July 3, 2015. (Photo by Anupam Nath/AP Photo)

A father players with his daughter at Destination America's Red, White & You event, Saturday, July 4, 2015, in Waveland, MS. (Photo by Jonathan Bachman/AP Images for Discovery Communications)

An Indian boy practices “Mallakhamb”, a traditional Indian gymnastic sport on a vertical wooden pole ahead of upcoming chariot festival of Lord Jagannath in Ahmadabad, India, Sunday, July 5, 2015. The festival will be celebrated on July 18, 2015. (Photo by Ajit Solanki/AP Photo)

Raghad Hamami, 11, cleans a traditional Ramadan lantern placed on the balcony of her family house during the holy month of Ramadan in Gaza City, northern Gaza Strip, Friday, July 3, 2015. Muslims throughout the world are marking the month of Ramadan, the holiest month in the Islamic calendar during which devotees fast from dawn till dusk. (Photo by Adel Hana/AP Photo)

A girl holds an empty jerry can before filling it with water from a public tap, amidst a water shortage in Sanaa, Yemen, June 26, 2015. (Photo by Mohamed al-Sayaghi/Reuters)

Civilians on a cart pulled by a horse travel along a street in Aleppo's Al-Shaar neighborhood June 27, 2015. (Photo by Abdalrhman Ismail/Reuters)

A firewoman speaks to a child dressed as a firefighter during a parade to celebrate Firemen's Day, in Concepcion, Chile, June 28, 2015. (Photo by Mariana Bazo/Reuters)

A boy plays with sand next to amphibious assault vehicles of the South Korean Marine Corps during a landing operation drill in Taean, South Korea, June 29, 2015. (Photo by Kim Hong-Ji/Reuters)

Palestinian girls read the Koran in a mosque during the holy month of Ramadan in the West Bank village of Aseera near Nablus June 30, 2015. (Photo by Abed Omar Qusini/Reuters)

An elementary school student walks past next to a rice paddy field in Kazo, north of Tokyo July 1, 2015. (Photo by Issei Kato/Reuters)

A girl jumps into the water to cool off from the heat at “Grugabad” open-air swimming pool on a hot summer day in Essen, Germany, June 30, 2015. A widespread, long-lasting heat wave will spread across much of France, U.K., Belgium, the Netherlands and western Germany with forecast highs on Wednesday reaching 35 degrees Celsius (95 degrees Fahrenheit). (Photo by Ina Fassbender/Reuters)

A girl waits for her family's ration at a food assistance center run by volunteers in Yemen's capital Sanaa July 1, 2015. (Photo by Khaled Abdullah/Reuters)

A boy wearing a lotus leaf on his head holds onto another leaf on a hot summer day in Beijing, China, July 2, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Michael, 4, plays under a fountain on a hot summer day in central Brussels, Belgium, July 2, 2015. The United Nations warned on Wednesday of the dangers posed by hot weather, especially to children and the elderly, as much of Europe sweltered in a heatwave whose intensity it blamed on climate change. (Photo by Yves Herman/Reuters)

In this June 16, 2015 photo, Palestinians enjoy a summer day on the beach of Gaza City. (Photo by Khalil Hamra/AP Photo)

Tristan, 4, plays with a toy Triceratops outside Hamleys on Regent Street on June 25, 2015 in London, England. The dinosaur, which is 1m30cm in length, sells for £750. The Hamleys toy shop have made their predictions for the top selling toys for Christmas 2015. (Photo by Rob Stothard/Getty Images)

A child stands along the roadside on June 27, 2015 in Bujumbura, Burundi. Burundi is one of the worlds poorest countries with food shortages throughout the cities and countryside. The head of Burundi's influential rights group Aprodeh says at least 70 people, mostly civilians, have been killed and hundreds of others wounded following weeks of political unrest in the small and landlocked country in the African Great Lakes region of East Africa. The violence started began President Pierre Nkurunziza announced his controversial bid for a third consecutive five-year term in office. The Office of the UN High Commissioner for Refugees (UNHCR) has said the violence in Burundi has forced more than 100,000 people to flee to neighbouring countries. (Photo by Spencer Platt/Getty Images)

Children cool off in the water fountains in Nice, southeastern France, Sunday, July 5, 2015. A mass of hot air moving north from Africa is bringing unusually hot weather to Western Europe, with France in recent days experiencing temperatures around 34 degrees Celsius (93 Fahrenheit). (Photo by Lionel Cironneau/AP Photo)

Three-year-old Iqal washes himself as he waits for the sun to go down during Ramadan in Kuala Lumpur, Malaysia, June 23, 2015. (Photo by Olivia Harris/Reuters)

Jessie Parker, 7, rides her decorated scooter for the Odessa Christian School camps 4th of July patriotic parade on Thursday, July 2, 2015, in Odessa, Texas. (Photo by Courtney Sacco/Odessa American via AP Photo)

Fans of Chile's national soccer celebrate their team's victory over Peru during the Copa America semifinal soccer match, in Santiago, Chile, Monday, June 29, 2015. Chile won the match 2-1. (Photo by Victor Ruiz/AP Photo)

Moldovan pose while being photographed by their mothers during a street musical event in Chisinau, Moldova, Sunday, May 24, 2015. (Photo by Vadim Ghirda/AP Photo)

A girl takes part in a rally organized by supporters of the No vote in Athens, Friday, July 3, 2015. (Photo by Petros Karadjias/AP Photo)

Kashmiri Muslim children recite verses from the holy Quran at a Muslim religious school, during the holy month of Ramadan in Srinagar, Indian controlled Kashmir, Thursday, July 2, 2015. Muslims across the world are observing the holy fasting month of Ramadan, where they refrain from eating, drinking and smoking from dawn to dusk. (Photo by Dar Yasin/AP Photo)

In this photo taken taken Tuesday, June 30, 2015, Henry Padgett, 5, from Waynesburg, Ky., holds onto Bulldozer, a Red New Zealand rabbit, during the 4-H/FFA & Youth Rabbit Show and Poultry Show in the Livestock Show Barn at the Lincoln County Fair near Stanford, Ky. (Photo by Clay Jackson/The Advocate-Messenger via AP Photo)

A child smiles as she embraces Pope Francis during an audience for the participants of the Convention of the Diocese of Rome in St. Peter's square at the Vatican City, June 14, 2015. (Photo by Giampiero Sposito/Reuters)

A Syrian refugee reacts as he waits behind border fences to cross into Turkey at Akcakale border gate in Sanliurfa province, Turkey, June 15, 2015. (Photo by Umit Bektas/Reuters)

Abiba, 3, poses for a picture a day ahead of the International Day of the African Child, in Abidjan, Ivory Coast June 15, 2015. (Photo by Luc Gnago/Reuters)

Afghan children play on the wreckage of an old Soviet armored vehicle in Kabul, Afghanistan, June 14, 2015. (Photo by Omar Sobhani/Reuters)

A young girls holds a ballot during the Greek referendum in Athens on July 5, 2015. Greek voters headed to the polls today to vote in a historic, tightly fought referendum on whether to accept worsening austerity in exchange for more bailout funds, in a gamble that could see it crash out of the euro. (Photo by Aris Messinis/AFP Photo)