School boy on a bicycle crossing a river on his way to school, Chi Phat, Koh Kong, Cambodia, Indochina, Southeast Asia, Asia

Colourfully dressed schoolgirls at their way home at the Pre-Aksumite settlement of Qohaito (Koloe), Eritrea, Africa

Young school boys eating sugar cane on their way back home from school, Masindi, Uganda, East Africa, Africa

Two school girls in military uniform on the way to school, Damascus, Syria, Middle East

Cambodian children on the way to school, Siem Reap, Cambodia, Indochina, Southeast Asia, Asia

Students dressed in Ao Dai on the way to school, Cai Be, Vietnam, Indochina, Southeast Asia, Asia

Pupils on their way to school, Lome, Togo, West Africa, Africa

Taichi training from Wudang School of Martial Arts, in front of Purple Heaven Hall, Zi Xiao Gong, peak 1613 metres high, Wudang Shan, Taoist mountain, Hubei province, Wudangshan, Mount Wudang, UNESCO world cultural heritage site, birthplace of Tai chi, China, Asia

Taichi training from Wudang School of Martial Arts, in front of Purple Heaven Hall, Zi Xiao Gong, peak 1613 metres high, Wudang Shan, Taoist mountain, Hubei province, Wudangshan, Mount Wudang, UNESCO world cultural heritage site, birthplace of Tai chi, China, Asia

Taichi training from Wudang School of Martial Arts, in front of Purple Heaven Hall, Zi Xiao Gong, peak 1613 metres high, Wudang Shan, Taoist mountain, Hubei province, Wudangshan, Mount Wudang, UNESCO world cultural heritage site, birthplace of Tai chi, China, Asia

School children queuing up on their way to school, Gisuma, Western Province, Rwanda, Africa

School children on their way to school, Gisuma, Western Province, Rwanda, Africa

Pupils on the way to Kung Fu training, new Kung Fu school, over 30.000 pupils are taught in different schools, Song Shan, Henan province, China

Students in the traditional ao dai dress on the way to school Vietnam

Entrance facade of the Staatliche Akademie der Bildenden Kuenste, State Academy of Fine Arts, Dresden, Saxony, Germany, Europe

School buses at the Japanese Tea Garden, San Francisco, California, USA, North America

Abdulaziz Chan, Khan Madrasah, Bukhara, Buchara, Unesco World Heritage Site, Uzbekistan, Central Asia

Mir-i, Miri Arab madrassah, Bukhara, Buchara, Silk Road, Unesco World Heritage Site, Uzbekistan, Central Asia

Large coloured pencils forming the gate of the A. Mozart School, Rue de l'Hotel de Ville, Marckolsheim, Alsace, France, Europe

St. Mary's Pre-School, kindergarten, City Quay, Republic of Ireland, Europe

Entrance of the Kalivianis convent, orphanage, girl boarding school and retirement home, Crete, Greece, Europe

Berliner Dom or Berlin Cathedral, Lustgarted park, Schlossplatz, demolition of the Palast der Republik, Springbrunnen fountain, European School of Management and Technology ESMT, Panorama, Berlin, Germany, Europe

Entrance facade of the Staatliche Akademie der Bildenden Kuenste, State Academy of Fine Arts, Dresden, Saxony, Germany, Europe

Entrance of the Kalivianis convent, orphanage, girl boarding school and retirement home, Crete, Greece, Europe

Large coloured pencils forming the gate of the A. Mozart School, Rue de l'Hotel de Ville, Marckolsheim, Alsace, France, Europe

Little boy on way to school, Nong Khiaw, Luang Prabang Province, Laos, Asia

Gate to Trinity College, founded in 1546 by Henry VIII, from the backyard, Trinity Street, Cambridge, Cambridgeshire, England, United Kingdom, Europe

CHL, Chile, Atacama Desert: Calama, on one's way to school.

School street sign city

1st anniversary of the massacre of Winnenden-Wendlingen, a path of pebbles with messages for the way into the future, Winnenden, Baden-Wuerttemberg, Germany, Europe

Entrance hall with staircase and skylight, Ludwig-Maximilians-Universitaet university or LMU, Munich, Bavaria, Germany, Europe

Girls on their way to school in road traffic, Upper Austria, Austria, Europe

Ben Youssef Madrasa, an Islamic college, Medina, historic district, UNESCO World Heritage site, Marrakech, Morocco, Africa

Girls on their way to school in road traffic, Upper Austria, Austria, Europe

Gate to Trinity College, founded by Henry VIII in 1546, from the backyard, Trinity Street, Cambridge, Cambridgeshire, England, United Kingdom, Europe

Historic priest seminary in Brixen, South Tyrol, Italy, Europe

Schloss Gracht castle, seat of the ESMT European School of Management and Technology, Erftstadt, North Rhine-Westphalia, Germany, Europe

Madonna and Child above the entrance, Rheinische Friedrich-Wilhelms-Universitaet or University of Bonn, former electoral palace, Cologne, Bonn, North Rhine-Westphalia, Germany, Europe

Historic McGill University building, Montreal, Quebec, Canada, North America

Entrance of Moni Kalivianis Abbey, orphanage, old people's home and girls' boarding school, Crete, Greece, Europe

Local children ride bicycles, way to school, Angkor Archaeological Park, Siem Reap Province, Cambodia, Asia

Park Building, University of Portsmouth, King Henry I Street, Portsmouth, Hampshire, England, United Kingdom, Europe

Entrance area of the Universitaet der Kuenste, Berlin University of the Arts, Berlin, Germany, Europe

Entrance of the historic university, Coimbra, Portugal, Europe

Warning sign on school way

Park Building, University of Portsmouth, King Henry I Street, Portsmouth, Hampshire, England, United Kingdom, Europe

Castle, Osnabrueck, Lower Saxony, Germany, Europe

University of San Jose, California, United States, America

University, former electoral palace, Bonn, Rhineland, North Rhine-Westphalia, Germany, Europe

Research assistants and technicians from the University of Ghana perform basic skin prick tests on school children in Accra, Ghana to test for sensitivities to dog, cat, dust mites, grass pollen, peanuts, and cockroach allergens. The results have shown that children in wealthier homes have higher rates of allergies and asthma than poorer children. The leading theory is that higher rates of helminth (parasite) infections among poorer children are affecting the immune system in a way that offers protection from allergies and asthma. The study aims to find out what the worms are doing, isolate the beneficial effect and replicate it.

Zainabu Ramadhani, 19, (yellow and red patterned skirt) her mother Fatma Mziray, age 38, (blue head dress) and Fatma’s sister-in-law Zaitun Hamad, 18, (orange wrap and white top) walk home after gathering firewood near Fatma’s home in Mforo. Mforo is near Moshi, Tanzania. Fatma Mziray is a Solar Sister entrepreneur who sells both clean cookstoves and solar lanterns. Fatma heard about the cookstoves from a Solar Sister development associate and decided to try one out. The smoke from cooking on her traditional wood stove using firewood was causing her to have a lot of heath problems, her lungs congested her eyes stinging and her doctor told her that she had to stop cooking that way. Some days she felt so bad she couldn't go in to cook. Fatma said, “Cooking for a family, preparing breakfast, lunch and dinner I used to gather a large load of wood every day to use. Now with the new cook stove the same load of wood can last up to three weeks of cooking. “With the extra time I can develop my business. I also have more time for the family. I can monitor my children’s studies. All of this makes for a happier family and a better relationship with my husband. Since using the clean cookstove no one has been sick or gone to the hospital due to flu.” Fatma sees herself helping her community because she no longer sees the people that she has sold cookstoves have red eyes, coughing or sick like they used to be. She has been able to help with the school fees for her children, purchase items for the home and a cow. “What makes me wake up early every morning and take my cookstoves and go to my business is to be able to take my family to school as well as to get food and other family needs.”

Zainabu Ramadhani, 19, (yellow and red patterned skirt) her mother Fatma Mziray, age 38, (blue head dress) and Fatma’s sister-in-law Zaitun Hamad, 18, (orange wrap and white top) walk home after gathering firewood near Fatma’s home in Mforo. Mforo is near Moshi, Tanzania. Fatma Mziray is a Solar Sister entrepreneur who sells both clean cookstoves and solar lanterns. Fatma heard about the cookstoves from a Solar Sister development associate and decided to try one out. The smoke from cooking on her traditional wood stove using firewood was causing her to have a lot of heath problems, her lungs congested her eyes stinging and her doctor told her that she had to stop cooking that way. Some days she felt so bad she couldn't go in to cook. Fatma said, “Cooking for a family, preparing breakfast, lunch and dinner I used to gather a large load of wood every day to use. Now with the new cook stove the same load of wood can last up to three weeks of cooking. “With the extra time I can develop my business. I also have more time for the family. I can monitor my children’s studies. All of this makes for a happier family and a better relationship with my husband. Since using the clean cookstove no one has been sick or gone to the hospital due to flu.” Fatma sees herself helping her community because she no longer sees the people that she has sold cookstoves have red eyes, coughing or sick like they used to be. She has been able to help with the school fees for her children, purchase items for the home and a cow. “What makes me wake up early every morning and take my cookstoves and go to my business is to be able to take my family to school as well as to get food and other family needs.”

Zainabu Ramadhani, 19, (yellow and red patterned skirt) her mother Fatma Mziray, age 38, (blue head dress) and Fatma’s sister-in-law Zaitun Hamad, 18, (orange wrap and white top) walk home after gathering firewood near Fatma’s home in Mforo. Mforo is near Moshi, Tanzania. Fatma Mziray is a Solar Sister entrepreneur who sells both clean cookstoves and solar lanterns. Fatma heard about the cookstoves from a Solar Sister development associate and decided to try one out. The smoke from cooking on her traditional wood stove using firewood was causing her to have a lot of heath problems, her lungs congested her eyes stinging and her doctor told her that she had to stop cooking that way. Some days she felt so bad she couldn't go in to cook. Fatma said, “Cooking for a family, preparing breakfast, lunch and dinner I used to gather a large load of wood every day to use. Now with the new cook stove the same load of wood can last up to three weeks of cooking. “With the extra time I can develop my business. I also have more time for the family. I can monitor my children’s studies. All of this makes for a happier family and a better relationship with my husband. Since using the clean cookstove no one has been sick or gone to the hospital due to flu.” Fatma sees herself helping her community because she no longer sees the people that she has sold cookstoves have red eyes, coughing or sick like they used to be. She has been able to help with the school fees for her children, purchase items for the home and a cow. “What makes me wake up early every morning and take my cookstoves and go to my business is to be able to take my family to school as well as to get food and other family needs.”

Mforo, Tanzania a village near Moshi, Tanzania. Solar Sister entrepreneur Fatma Mziray and her eldest daughter Zainabu Ramadhani, 19 cook lunch in her kitchen house using both a clean cookstove using wood and one using coal. One of her younger daughters, Nasma Ramadhani, age 5 helps out. Fatma Mziray is a Solar Sister entrepreneur who sells both clean cookstoves and solar lanterns. Fatma heard about the cookstoves from a Solar Sister development associate and decided to try one out. The smoke from cooking on her traditional wood stove using firewood was causing her to have a lot of heath problems, her lungs congested her eyes stinging and her doctor told her that she had to stop cooking that way. Some days she felt so bad she couldn't go in to cook. Fatma said, “Cooking for a family, preparing breakfast, lunch and dinner I used to gather a large load of wood every day to use. Now with the new cook stove the same load of wood can last up to three weeks of cooking. “With the extra time I can develop my business. I also have more time for the family. I can monitor my children’s studies. All of this makes for a happier family and a better relationship with my husband. Since using the clean cookstove no one has been sick or gone to the hospital due to flu.” Fatma sees herself helping her community because she no longer sees the people that she has sold cookstoves have red eyes, coughing or sick like they used to be. She has been able to help with the school fees for her children, purchase items for the home and a cow. “What makes me wake up early every morning and take my cookstoves and go to my business is to be able to take my family to school as well as to get food and other family needs.”

Research assistants and technicians from the University of Ghana perform basic skin prick tests on school children in Accra, Ghana to test for sensitivities to dog, cat, dust mites, grass pollen, peanuts, and cockroach allergens. The results have shown that children in wealthier homes have higher rates of allergies and asthma than poorer children. The leading theory is that higher rates of helminth (parasite) infections among poorer children are affecting the immune system in a way that offers protection from allergies and asthma. The study aims to find out what the worms are doing, isolate the beneficial effect and replicate it.

Ecuador's capital and second largest city students on the way to Manuela Canizares Experimental Girls School, New Town area, Quito, Ecuador

USA, New York City, school bus in blizzard

Traditional Muslim children: girls wear abayas, boys wear kofias, traditional hats, on their way to school in the narrow streets of Stone Town, capital of Zanzibar, Tanzania.

Traditional Muslim girl on her way to school, wearing an abaya, Stone Town, capital of Zanzibar, Tanzania