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    Front view of a Caucasian teenage girl sitting in a classroom playing a violin at a school band practice, with other teenage musicians sitting in the foreground — Stock Photo
    Front view of a Caucasian teenage girl sitting in a classroom playing a violin at a school band practice, with other teenage musicians sitting in the foreground
    Schoolboy standing in the classroom at school — Stock Photo
    Schoolboy standing in the classroom at school
    Junior high school students in classroom — Stock Photo
    Junior high school students in classroom
    Portrait of a Caucasian female field hockey player, preparing before a game, standing on a hockey pitch, looking at camera, holding a hockey stick on her shoulders, with her teammates standing in the background on a sunny day — Stock Photo
    Portrait of a Caucasian female field hockey player, preparing before a game, standing on a hockey pitch, looking at camera, holding a hockey stick on her shoulders, with her teammates standing in the background on a sunny day
    Male teacher teaching students in the class at school — Stock Photo
    Male teacher teaching students in the class at school
    Schoolboy looking at globe in classroom at school — Stock Photo
    Schoolboy looking at globe in classroom at school
    Close up profile girl student using microscope, conducting scientific experiment — Stock Photo
    Close up profile girl student using microscope, conducting scientific experiment
    High school students watching teacher leading lesson at whiteboard in classroom — Stock Photo
    High school students watching teacher leading lesson at whiteboard in classroom
    Female science teacher and students in laboratory classroom — Stock Photo
    Female science teacher and students in laboratory classroom
    Portrait of a confident Caucasian female field hockey goalkeeper, training before a game, standing on a hockey pitch, looking at camera, wearing a hockey helmet, with her teammates standing in the background on a sunny day — Stock Photo
    Portrait of a confident Caucasian female field hockey goalkeeper, training before a game, standing on a hockey pitch, looking at camera, wearing a hockey helmet, with her teammates standing in the background on a sunny day
    France, Limousin, triticale field, hybrid of wheat and rye, near Aubusson. — Stock Photo
    France, Limousin, triticale field, hybrid of wheat and rye, near Aubusson.
    Junior high girl students entering library — Stock Photo
    Junior high girl students entering library
    High school teacher helping students with homework in classroom — Stock Photo
    High school teacher helping students with homework in classroom
    Ovary. Light micrograph (LM) of section through whole ovary. Cortex (outer region) contains numerous corpora lutea (pink) and follicles (purple) at various stages of development — Stock Photo
    Ovary. Light micrograph (LM) of section through whole ovary. Cortex (outer region) contains numerous corpora lutea (pink) and follicles (purple) at various stages of development
    Girl students studying at computers in library — Stock Photo
    Girl students studying at computers in library
    Woman reading file while practicing experiment in lab — Stock Photo
    Woman reading file while practicing experiment in lab
    Boy playing table tennis — Stock Photo
    Boy playing table tennis
    Portrait of a Caucasian male field hockey coach, preparing his team for a game, standing on a hockey pitch, looking at camera, with his team standing in the background on a sunny day — Stock Photo
    Portrait of a Caucasian male field hockey coach, preparing his team for a game, standing on a hockey pitch, looking at camera, with his team standing in the background on a sunny day
    France, Northern France, Pas de Calais, inland between Calais, Dunkerque and St-Omer. — Stock Photo
    France, Northern France, Pas de Calais, inland between Calais, Dunkerque and St-Omer.
    Old White Frontier Church — Stock Photo
    Old White Frontier Church
    Focused junior high school student doing homework in classroom — Stock Photo
    Focused junior high school student doing homework in classroom
    Side view of a group of female Caucasian field hockey players preparing before a game, kneeling in front of their Caucasian male coach, on a hockey pitch, who gives them game plan, on a sunny day — Stock Photo
    Side view of a group of female Caucasian field hockey players preparing before a game, kneeling in front of their Caucasian male coach, on a hockey pitch, who gives them game plan, on a sunny day
    Portrait of happy junior high friends playing basketball in schoolyard — Stock Photo
    Portrait of happy junior high friends playing basketball in schoolyard
    France, Southern France, Vileveyrac, Cistercian abbey of Holy Mary of Valmagne, 13th century, gothic style, nave turned into a wine storehouse after the Revolution — Stock Photo
    France, Southern France, Vileveyrac, Cistercian abbey of Holy Mary of Valmagne, 13th century, gothic style, nave turned into a wine storehouse after the Revolution
    Schoolgirl explaining about world map in classroom at school — Stock Photo
    Schoolgirl explaining about world map in classroom at school
    Side view of a multi-ethnic group of teenage male field hokey players, training with their coach before a game, working out on a field hockey pitch on a sunny day, running on the spot — Stock Photo
    Side view of a multi-ethnic group of teenage male field hokey players, training with their coach before a game, working out on a field hockey pitch on a sunny day, running on the spot
    Side view of a group of female Caucasian field hockey players preparing before a game, sitting on a stand, holding hockey sticks, with their Caucasian male field hockey coach standing in front of them, talking about game plan on a sunny day — Stock Photo
    Side view of a group of female Caucasian field hockey players preparing before a game, sitting on a stand, holding hockey sticks, with their Caucasian male field hockey coach standing in front of them, talking about game plan on a sunny day
    Female teenage students studying at desk in classroom — Stock Photo
    Female teenage students studying at desk in classroom
    Side view of a group of female Caucasian field hockey players and their Caucasian field hockey coach, training before a game, working out on a field hockey pitch, exercising, doing sit ups, on a sunny day — Stock Photo
    Side view of a group of female Caucasian field hockey players and their Caucasian field hockey coach, training before a game, working out on a field hockey pitch, exercising, doing sit ups, on a sunny day
    Happy female teacher talking with colleague — Stock Photo
    Happy female teacher talking with colleague
    Front view mid section of musician teenage boy with yellow t-shirt sitting and playing an acoustic guitar in a high school — Stock Photo
    Front view mid section of musician teenage boy with yellow t-shirt sitting and playing an acoustic guitar in a high school
    Front view of a Caucasian female field hockey players, training before a game, standing on a hockey pitch, holding hockey sticks, looking at camera, on a sunny day — Stock Photo
    Front view of a Caucasian female field hockey players, training before a game, standing on a hockey pitch, holding hockey sticks, looking at camera, on a sunny day
    Side view of a Caucasian female field hockey player training before a game, working out on a hockey pitch, shading her eyes from the sun, with her teammates in the background, on a sunny day — Stock Photo
    Side view of a Caucasian female field hockey player training before a game, working out on a hockey pitch, shading her eyes from the sun, with her teammates in the background, on a sunny day
    Teenage girl holding pipette while practicing chemistry experiment at desk in lab — Stock Photo
    Teenage girl holding pipette while practicing chemistry experiment at desk in lab
    Smiling students using digital tablet in classroom — Stock Photo
    Smiling students using digital tablet in classroom
    Girl students using microscope, conducting scientific experiment in laboratory classroom — Stock Photo
    Girl students using microscope, conducting scientific experiment in laboratory classroom
    Side view of two high school African American teenage female school pupils, using a smartphone and sitting on steps in the school grounds — Stock Photo
    Side view of two high school African American teenage female school pupils, using a smartphone and sitting on steps in the school grounds
    Front view close up of a teenage Caucasian girl in a school classroom sitting at desk, concentrating and writing, with teenage male and female classmates sitting at desks working in the background — Stock Photo
    Front view close up of a teenage Caucasian girl in a school classroom sitting at desk, concentrating and writing, with teenage male and female classmates sitting at desks working in the background
    Male teacher and boy student using microscope, conducting scientific experiment in laboratory classroom — Stock Photo
    Male teacher and boy student using microscope, conducting scientific experiment in laboratory classroom
    Curious, smiling girl students listening in classroom — Stock Photo
    Curious, smiling girl students listening in classroom
    Male student showing clipboard to classmate while practicing chemistry experiment in lab — Stock Photo
    Male student showing clipboard to classmate while practicing chemistry experiment in lab
    Girl students assembling robotics in classroom — Stock Photo
    Girl students assembling robotics in classroom
    Front view of a multi-ethnic group of male and female teenager students sitting on a wall talking and using tablet computers in their school grounds — Stock Photo
    Front view of a multi-ethnic group of male and female teenager students sitting on a wall talking and using tablet computers in their school grounds
    Front view of a multi-ethnic group of teenage school pupils and their Caucasian male teacher standing in a classroom looking at laptop computers together, the pupils listening while the teacher talks — Stock Photo
    Front view of a multi-ethnic group of teenage school pupils and their Caucasian male teacher standing in a classroom looking at laptop computers together, the pupils listening while the teacher talks
    Portrait smiling, confident girl student solving physics equations at whiteboard in classroom — Stock Photo
    Portrait smiling, confident girl student solving physics equations at whiteboard in classroom
    Portrait of a Caucasian teenage boy sitting at a desk in a school classroom looking out of the window, thinking — Stock Photo
    Portrait of a Caucasian teenage boy sitting at a desk in a school classroom looking out of the window, thinking
    High school students with hands raised in debate class — Stock Photo
    High school students with hands raised in debate class
    Front view of a multi-ethnic group of teenage male field hockey players preparing before a game, in a huddle on the pitch, interacting on a sunny day — Stock Photo
    Front view of a multi-ethnic group of teenage male field hockey players preparing before a game, in a huddle on the pitch, interacting on a sunny day
    Side view of a teenage Caucasian boy holding sitting in front of a window in a classroom holding a French horn with a multi-ethnic group of teenage male and female musicians sitting behind him — Stock Photo
    Side view of a teenage Caucasian boy holding sitting in front of a window in a classroom holding a French horn with a multi-ethnic group of teenage male and female musicians sitting behind him
    Side view close up of a Caucasian female field hockey players, preparing before a game, standing in a changing room, wearing a hockey helmet, with her teammates standing in a row behind her — Stock Photo
    Side view close up of a Caucasian female field hockey players, preparing before a game, standing in a changing room, wearing a hockey helmet, with her teammates standing in a row behind her
    Female college students practicing chemistry experiment at desk in lab — Stock Photo
    Female college students practicing chemistry experiment at desk in lab
    Side view of a teenage mixed race male field hockey player taking a shot at goal during a field hockey match, with player form both teams in the background and the goalkeeper preparing to block the shot, on a sunny day — Stock Photo
    Side view of a teenage mixed race male field hockey player taking a shot at goal during a field hockey match, with player form both teams in the background and the goalkeeper preparing to block the shot, on a sunny day
    High school girl students talking at table in classroom during lesson — Stock Photo
    High school girl students talking at table in classroom during lesson
    Focused girl student assembling circuit board in classroom — Stock Photo
    Focused girl student assembling circuit board in classroom
    Young college students practicing experiment in lab — Stock Photo
    Young college students practicing experiment in lab
    Portrait of a Caucasian teenage girl with long, dark hair and brown eyes standing in a school classroom smiling to camera, with classmates talking in the background — Stock Photo
    Portrait of a Caucasian teenage girl with long, dark hair and brown eyes standing in a school classroom smiling to camera, with classmates talking in the background
    Portrait confident junior high school boy studying in classroom — Stock Photo
    Portrait confident junior high school boy studying in classroom
    Rear view of a Caucasian male field hockey coach interacting with a group of female Caucasian field hockey players, sitting in a changing room — Stock Photo
    Rear view of a Caucasian male field hockey coach interacting with a group of female Caucasian field hockey players, sitting in a changing room
    Portrait close up of a Caucasian teenage boy with dark hair and grey eyes sitting at a desk in a school classroom wearing headphones around his neck, smiling to camera — Stock Photo
    Portrait close up of a Caucasian teenage boy with dark hair and grey eyes sitting at a desk in a school classroom wearing headphones around his neck, smiling to camera
    Side view of a Caucasian female field hockey player preparing before a game, sitting in a changing room, wearing a hockey helmet — Stock Photo
    Side view of a Caucasian female field hockey player preparing before a game, sitting in a changing room, wearing a hockey helmet