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    Front view of a male Caucasian teacher standing, using a laptop and talking to a multi-ethnic group of teenagers in a school high school classroom sitting at desks and listening — Stock Photo
    Front view of a male Caucasian teacher standing, using a laptop and talking to a multi-ethnic group of teenagers in a school high school classroom sitting at desks and listening
    Side view mid section of female field hockey players, training before a game, working out on a hockey pitch, exercising, on a sunny day — Stock Photo
    Side view mid section of female field hockey players, training before a game, working out on a hockey pitch, exercising, on a sunny day
    Low section close up of female field hockey player preparing before a game, sitting in a changing room, putting on her leg pad — Stock Photo
    Low section close up of female field hockey player preparing before a game, sitting in a changing room, putting on her leg pad
    Schoolboy writing on chalkboard in classroom at school — Stock Photo
    Schoolboy writing on chalkboard in classroom at school
    Students watching chemical reaction, conducting scientific experiment in laboratory classroom — Stock Photo
    Students watching chemical reaction, conducting scientific experiment in laboratory classroom
    Curious girl student examining molecular structure — Stock Photo
    Curious girl student examining molecular structure
    Junior high students talking — Stock Photo
    Junior high students talking
    Side view of a multi-ethnic group of high school teenage male and female school pupils in a classroom, working on computers and concentrating — Stock Photo
    Side view of a multi-ethnic group of high school teenage male and female school pupils in a classroom, working on computers and concentrating
    High school students clapping for classmate in debate class — Stock Photo
    High school students clapping for classmate in debate class
    Male teacher teaching students in the classroom at school — Stock Photo
    Male teacher teaching students in the classroom at school
    Digital illustration of solid node in right lung near lung apex while secondary tuberculosis infection. — Stock Photo
    Digital illustration of solid node in right lung near lung apex while secondary tuberculosis infection.
    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
    Students conducting scientific experiment in laboratory classroom — Stock Photo
    Students conducting scientific experiment in laboratory classroom
    Front view of a teenage Caucasian boy and a teenage African American girl in a high school classroom sitting a desk, using a tablet computer, with teenage classmates sitting at desks working in the background — Stock Photo
    Front view of a teenage Caucasian boy and a teenage African American girl in a high school classroom sitting a desk, using a tablet computer, with teenage classmates sitting at desks working in the background
    Portrait confident junior high school students in classroom — Stock Photo
    Portrait confident junior high school students in classroom
    Portrait of male college student with arms crossed standing in lab — Stock Photo
    Portrait of male college student with arms crossed standing in lab
    Side view mid section of a Caucasian female field hockey player, training before a game, working out on a hockey pitch, exercising, with two her teammates and a coach, on a sunny day — Stock Photo
    Side view mid section of a Caucasian female field hockey player, training before a game, working out on a hockey pitch, exercising, with two her teammates and a coach, 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
    Front view close up of a teenage Caucasian girl in a school classroom sitting at desk, concentrating and reading, 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 reading, with teenage male and female classmates sitting at desks working in the background
    Girl students using microscope, conducting scientific experiment in laboratory classroom — Stock Photo
    Girl students using microscope, conducting scientific experiment in laboratory classroom
    Rear view of two Caucasian teenage couples with schoolbags holding hands and walking across a school playing field on a sunny day — Stock Photo
    Rear view of two Caucasian teenage couples with schoolbags holding hands and walking across a school playing field on a sunny day
    Front view of a group of confident female Caucasian field hockey players, preparing before a game, standing in a row, with arms crossed, looking at camera, on a sunny day — Stock Photo
    Front view of a group of confident female Caucasian field hockey players, preparing before a game, standing in a row, with arms crossed, looking at camera, on a sunny day
    Female teacher helping students working at computers in computer lab classroom — Stock Photo
    Female teacher helping students working at computers in computer lab classroom
    Central Asia, Kyrgyzstan, Issyk Kul Province (Ysyk-K?l), not far from Karakol, haystacks — Stock Photo
    Central Asia, Kyrgyzstan, Issyk Kul Province (Ysyk-K?l), not far from Karakol, haystacks
    Focused junior high school girl student listening in classroom — Stock Photo
    Focused junior high school girl student listening in classroom
    Side view low section of male field hockey player in action on the pitch, preparing to hit a ball from the middle line on a sunny day, backlit — Stock Photo
    Side view low section of male field hockey player in action on the pitch, preparing to hit a ball from the middle line on a sunny day, backlit
    College students using microscope while practicing experiment in lab — Stock Photo
    College students using microscope while practicing experiment in lab
    Side view close up of a teenage Caucasian boy in a school classroom sitting at desk, concentrating, looking out of the window, leaning his head on his hand — Stock Photo
    Side view close up of a teenage Caucasian boy in a school classroom sitting at desk, concentrating, looking out of the window, leaning his head on his hand
    Teacher leading lesson, calling on students in classroom — Stock Photo
    Teacher leading lesson, calling on students in classroom
    Portrait of a Caucasian musician young pretty teenage girl sitting by a window playing the violin in a high school — Stock Photo
    Portrait of a Caucasian musician young pretty teenage girl sitting by a window playing the violin in a high school
    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
    Front view of multi-ethnic group of teenage boys and girls holding scripts and performing on the stage of a school theatre during rehearsals for a performance — Stock Photo
    Front view of multi-ethnic group of teenage boys and girls holding scripts and performing on the stage of a school theatre during rehearsals for a performance
    Side view of a multi-ethnic group of high school teenage male and female school pupils in a classroom, sitting at a table working together — Stock Photo
    Side view of a multi-ethnic group of high school teenage male and female school pupils in a classroom, sitting at a table working together
    Portrait of a Caucasian teenage girl sitting at a desk in a school classroom writing in a notebook and looking to camera smiling, with classmates sitting at desks working in the background — Stock Photo
    Portrait of a Caucasian teenage girl sitting at a desk in a school classroom writing in a notebook and looking to camera smiling, with classmates sitting at desks working in the background
    Junior high students talking — Stock Photo
    Junior high students talking
    Front view of a multi-ethnic group of teenage pupils sitting at desks in class studying at school with a Caucasian male teacher standing and talking to one Caucasian boy at his desk — Stock Photo
    Front view of a multi-ethnic group of teenage pupils sitting at desks in class studying at school with a Caucasian male teacher standing and talking to one Caucasian boy at his desk
    Side view of a Caucasian teenage schoolboy sitting at a desk in class by a window using a smartphone and concentrating — Stock Photo
    Side view of a Caucasian teenage schoolboy sitting at a desk in class by a window using a smartphone and concentrating
    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
    Ovarian cells section — Stock Photo
    Ovarian cells section
    Portrait close up of a Caucasian teenage boy sitting by a window holding an acoustic guitar and looking to camera in a high school — Stock Photo
    Portrait close up of a Caucasian teenage boy sitting by a window holding an acoustic guitar and looking to camera in a high school
    Teenagers and teacher talking in community center — Stock Photo
    Teenagers and teacher talking in community center
    Side view of a group of female Caucasian field hockey players, training before a game, working out on a field hockey pitch, exercising, stretching, on a sunny day — Stock Photo
    Side view of a group of female Caucasian field hockey players, training before a game, working out on a field hockey pitch, exercising, stretching, on a sunny day
    Smiling male science teacher helping girl students conducting scientific experiment at microscope in laboratory — Stock Photo
    Smiling male science teacher helping girl students conducting scientific experiment at microscope in laboratory
    France, Normandy, Montmartin-sur Mer, Haystacks mechanically rolled at the time of harvest. — Stock Photo
    France, Normandy, Montmartin-sur Mer, Haystacks mechanically rolled at the time of harvest.
    Digital molecular model of secondary structure of immunoglobulin G antibody. — Stock Photo
    Digital molecular model of secondary structure of immunoglobulin G antibody.
    Schoolgirl explaining about world map in classroom at school — Stock Photo
    Schoolgirl explaining about world map in classroom at school
    Low section front view close up of two teenage female high school pupils, using smartphones and sitting on steps in the school grounds — Stock Photo
    Low section front view close up of two teenage female high school pupils, using smartphones and sitting on steps in the school grounds
    Portrait smiling, confident tween boy playing basketball in schoolyard — Stock Photo
    Portrait smiling, confident tween boy playing basketball in schoolyard
    Coloured X-ray of the chest of a 52 year old female patient with metastatic (secondary) lung cancer (yellow). — Stock Photo
    Coloured X-ray of the chest of a 52 year old female patient with metastatic (secondary) lung cancer (yellow).
    Smiling teenage girl keeping book in shelf in library — Stock Photo
    Smiling teenage girl keeping book in shelf in library
    Portrait of college students with arms crossed standing in lab — Stock Photo
    Portrait of college students with arms crossed standing in lab
    Side view of a teenage Caucasian male field hockey player preparing to hit a ball, during a hockey game between two multi-ethnic teenage male teams on a sunny day — Stock Photo
    Side view of a teenage Caucasian male field hockey player preparing to hit a ball, during a hockey game between two multi-ethnic teenage male teams on a sunny day
    Male teacher teaching students in the classroom at school — Stock Photo
    Male teacher teaching students in the classroom at school
    Portrait confident junior high girl student with braces — Stock Photo
    Portrait confident junior high girl student with braces
    Front view of a teenage Caucasian boy in a school classroom sitting at desk, concentrating and looking out of the window, with teenage male and female classmates sitting at desks working in the background — Stock Photo
    Front view of a teenage Caucasian boy in a school classroom sitting at desk, concentrating and looking out of the window, with teenage male and female classmates sitting at desks working in the background
    Pensive girl student conducting science experiment in classroom laboratory — Stock Photo
    Pensive girl student conducting science experiment in classroom laboratory
    Students writing their GCSE exam in classroom — Stock Photo
    Students writing their GCSE exam in classroom
    Woman reading file while practicing experiment in lab — Stock Photo
    Woman reading file while practicing experiment in lab
    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
    Front view of a multi-ethnic group of teenage school pupils sitting at desks in a classroom and raising their hands — Stock Photo
    Front view of a multi-ethnic group of teenage school pupils sitting at desks in a classroom and raising their hands