India Waseem Andrabi/Hindustan Times/Getty Images Kashmiri school girls playing during recess in Kulhama district, Bandipora on August 11, 2015 in Srinagar, India.

Somalia SIMON MAINA via Getty Images Pupils walk on September 10, 2013 inside the Gambool high school in the Garowe region, Somaliland. The school is a project funded by the European Commission and has the capacity for 1,750 pupils both boys and girls. As key partners, Somalia and the European Union (EU) will be co-hosting a High Level Conference on A New Deal for Somalia in Brussels on September 16, 2013.

Japan Reuters School girls, wearing surgical masks, cross a street at lunch time in Kyoto, western Japan November 19, 2014.

Philippines Lorgina Minguito / Reuters A woman accompanies some students as they wade in the shallow part of a rocky beach to their school to attend the first day of classes in Sitio Kinabuksan, Kawag village, Subic, Zambales Province, north of Manila June 1, 2015.

India Jonas Gratzer/LightRocket/Getty Images Children sit on the ground with a temporary roof to protect them against the strong sun in a small village called Bilwadi in the state of Rajasthan. The children who come from nomadic families are 6-14 years olds who are taught mathematics as well as reading and writing in Hindi. This photo was taken on October 29, 2014.

Iran Behrouz Mehri/AFP/Getty Images Iranian school girls observe Members of Parliament discussing a draft to limit photographer's and cameramen's access to cover parliament's open sessions in Tehran on February 27, 2013.

South Africa Siphiwe Sibeko / Reuters School girls walk past riot police standing guard outside Hillbrow magistrate court during an appearance of students who were arrested during a protest demanding free education at the Johannesburg's University of the Witwatersrand, South Africa, October 12, 2016.

The United States Brian Snyder / Reuters Precious Perez listens during a class on United States history at a high school in Chelsea, Massachusetts January 24, 2014. Sixteen-year-old Perez has been blind since birth. She lives in Chelsea, Massachusetts, a working-class city on the outskirts of Boston. Her life is both like and unlike that of many of her contemporaries, blind or sighted. She walks with a friend to their public high school in the morning, takes voice lessons, plays goalball, and spends her time on social media. Picture taken January 24, 2014.

Hong Kong ANTHONY WALLACE via Getty Images School students walk down a street in Hong Kong on July 4, 2016.

Brazil Yasuyoshi Chiba/AFP/Getty Images Girls attend a class at a school in the forest in Xapuri, Acre State, in northwestern Brazil, on October 8, 2014.

Iraq HAIDAR HAMDANI via Getty Images An Iraqi school girl walks up the bank of a river after crossing the waterway on a small wooden boat in the district of Al-Mishikhab, some 25 kilometers south of the holy city of Najaf, as they head to school on April 1, 2015. According to Iraqi women in this area boat is one of the only ways for them to travel.

Syria Bassam Khabieh / Reuters A girl carrying a school bag walks in eastern al-Ghouta, near Damascus October 21, 2014.

China Johannes Eisele/AFP/Getty Images Chinese children attend a class at the Jinqao Center Primary School in Shanghai on September 1, 2014.

Afghanistan Sham Marai/AFP/Getty Images Afghan schoolgirls board a bus in Qara Zaghan village in Baghlan province on May 7, 2013.

Kenya AFP via Getty Images Two school girls walk towards a commuter train in Kikuyu, Kenya, on September 13, 2016. The railway in Kenya has a long history, with the British laying the country's first rail in 1896.

Russia Natalia Kolesnikova/AFP/Getty Images High-school graduates celebrate the last day of their classes in Moscow's Red Square on May 25, 2011.

Gambia Thierry Gouegnon / Reuters Two school girls walk at Kairaba avenue in Banjul, Gambia January 24, 2017.

Haiti Thony Belizaire/AFP/Getty Images Brazilian UN peacekeepers distribute juice and crackers to students at the Immaculate Conception School February 6, 2013 in Port-au-Prince, Haiti.

Bangladesh Thomas Trutschel via Getty Images Savar, Bangladesh - April 13: Girls in school uniform walking along a road after school on April 13, 2016 in Savar, Bangladesh.

Iran Ahmed Jadallah / Reuters School girls walk down the street in Iranian President Mahmoud Ahmadinejad's birth village of Aradan, east of Tehran, March 12, 2008.

England Christopher Furlong/Getty Images Withington Independent Girls School students celebrate getting good grades on their A level exams on August 15, 2013 in Manchester, England.

Morocco FADEL SENNA via Getty Images A Moroccan girl walks to the school in Taghzirt, an isolated village in the el-Haouz province in the High Atlas Mountains south of Marrakesh on March 4, 2016.

Spain Marcelo Del Pozo / Reuters School children wearing costumes walk during a school excursion to a permanent exhibition at Velazquez research centre in Seville May 11, 2009.

Sri Lanka Lakruwan Wanniarachchi/AFP/Getty Images Sri Lankan Muslim school girls stand on the edge of a sea port in Colombo on May 20, 2013, after traveling from their town of Kalmunai, over 231 miles away.

Germany Konzept Und Bild/Ullstein Bild/Getty Images Students of the 7th and 8th classes swimming during a school triathlon on June 19, 2010 in Berlin, Germany.

South Korea Ed Jones/AFP/Getty Images Students take the annual Scholastic Aptitude Test at the Poongmun high school in Seoul on November 13, 2014.

Central African Republic Thomas Koehler/Photothek/Getty Images A student stands in a classroom at a school in the capital city of Bangui, Central African Republic on March 12, 2014.

Cuba STR/AFP/Getty Images Cuban schoolgirls read during class on November 13, 2012 in Havana.

Ecuador Eitan Abramovich/AFP/Getty Images Girls pose at a rural school at La Palizada in Tulcan, Carchi province, in Ecuador close to the Colombian border on November 7, 2012.

China Liu Jin/Getty Images A class of students run during a physical training exercise at the temporary campus of the "Walking School" of Xu Xiangyang Education and Training Group on December 22, 2005, on the outskirts of China's southwestern city of Chengdu.

Kosovo Chris Hondros/Getty Images A Kosovo Albanian girl answers a question in a sociology class at Sami Frasheri high school in Pristina, March 2007. (At the time Kosovo was in the process of formalizing its independence from Serbia.)

Zimbabwe Raphael Huenerfauth/Photothek/Getty Images A young schoolgirl listens to a concert at the Glen Forest Development Centre on December 3, 2012 in Harare, Zimbabwe.

North Korea Eric Lafforgue/Getty Images Primary School students in North Korea on May 16, 2009.

Iraq Thaier Al-Sudani / Reuters Girls walk past a U.S. soldier on a patrol with the Iraqi police in Baghdad's Ameen district October 14, 2008.

China China Photos/Getty Images Students read outdoors at the Jigmei Gyaltsen Girls Welfare School on April 21, 2006 in Maqin County of Guoluo Tibetan Autonomous Prefecture, Qinghai Province, China. The Jigmei Gyaltsen Girls Welfare School, established in 2005, was built to provide free education for impoverished female students in pasturing areas. The school currently has about 96 students and 10 teachers, teaching Tibetan, Chinese, mathematics, art and other courses.

Kenya Tony Karumba/AFP/Getty Images Schoolgirls participate in a lesson in Kilifi, Kenya on June 31, 2010. The students are part of an initiative called "Moving the Goalspost" which sponsors female students from the Kilifi district where drop-out rates are high due to early marriages, teen pregnancy and a traditional bias towards educating male siblings over female.

Nepal Education Images/UIG/Getty Images School girls in orange uniforms walk to school along a trail around Manaslu Trek, Nepal.

Bangladesh Majority World/UIG/Getty Images Children learning their lessons at home, in a village in Netrok.

Indonesia Beawiharta Beawiharta / Reuters Students hold on to the side steel bars of a collapsed bridge as they cross a river to get to school at Sanghiang Tanjung village in Lebak regency, Indonesia's Banten village January 19, 2012.

Cuba Konzept Und Bild/Ullstein Bild/Getty Images School girls wearing school uniforms on the way home on June 1, 2009 in Trinidad, Cuba.

Afghanistan Wally Skalij/Getty Images Afghani girls raise their hands to answer a question in math class. 

Kenya Noor Khamis / Reuters Girls walk to school during the early morning in the Kibera slums in Kenya's capital Nairobi February 15, 2013.

Vietnam Chau Doan/LightRocket/Getty Images H'mong students exercise at Hoang Thu Pho primary school in Bac Ha, Lao Cai, Vietnam.

France Patrick Hertzog/AFP/Getty Images Girls hug each other on the first day of school outside the European School of Strasbourg in Strasbourg, France on September 1, 2015.

Mozambique Thomas Trutschel/Photothek/Getty Images Students in school uniforms pose for a photo on September 29, 2015 in Beira, Mozambique.

Mexico RONALDO SCHEMIDT via Getty Images Two girls walk after receiving their meal at the Adolfo Lopez Mateos school, in Villa de Zaachila, Oaxaca State, Mexico on July 5, 2016.

Gaza Mahmud Hams/AFP/Getty Images Palestinian school girls walk during a sandstorm in Gaza City on September 9, 2015.

Yemen Mohammed Huwais/AFP/Getty Images Yemeni girls listen to their teacher on their fist day of school at a public institution in the Yemeni capital Sanaa on November 1, 2015.

South Korea Ed Jones/AFP/Getty Images Students wearing traditional hanbok dresses bow as they attend a graduation and coming-of-age ceremony at the Dongmyeong girl's high school in Seoul on February 12, 2015.

Gaza MAHMUD HAMS via Getty Images Palestinian girls walk past buildings which were destroyed by Israeli strikes on their way to school in the Shejaiya neighbourhood of Gaza City on September 14, 2014 on the first day of the new school year.

India STRDEL/AFP/Getty Images Indian schoolchildren pray during morning assembly at their school in Shimla on December 17, 2014, as they pay tribute to slain Pakistani schoolchildren and staff after an attack on an army school in the restive city of Peshawar.

Mexico Pedro Pardo/AFP/Getty Images Children play during a break after returning to school following a two-months strike of teachers due to criminal threats, in Acapulco, Mexico on January 27, 2015.

Yemen Mohammed Huwais/AFP/Getty Images Yemeni schoolgirls attend an anti-mine and unexploded ordnance awareness campaign in a school in Sanaa on December 17, 2014.

The United States Ann Hermes/The Christian Science Monitor/Getty Images Students listen to instructions during a coding class at The Young Women's Leadership School of Astoria in New York on September 17, 2015.

Bangladesh NurPhoto via Getty Images A school going girl walks through a water logged street in Dhaka, Bangladesh, 01 October 2013. Climate change in Bangladesh is an extremely crucial issue for last decade.

Ghana Melanie Stetson Freeman/The Christian Science Monitor/Getty Images School girls head home through their cocoa-producing village on November 11, 2015 in Akyekyere, Ghana.

Thailand Thierry Falise/LightRocket/Getty Images Young female students in a "pondok," a school providing general and religious studies on June 29, 2015 in Narathiwat, Thailand.

The United States Katherine Frey/The Washington Post/Getty Images A girls' track team runs through traffic as they travel to McKinley High School where they practice on May 28, 2013 in Washington, DC.