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    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
    Schoolkids using globe in classroom at school — Stock Photo
    Schoolkids using globe in classroom at school
    High school students with hands raised, asking questions during lesson in classroom — Stock Photo
    High school students with hands raised, asking questions during lesson in classroom
    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
    Teacher leading lesson, calling on students in classroom — Stock Photo
    Teacher leading lesson, calling on students in classroom
    Female science teacher and girl student writing at whiteboard in classroom — Stock Photo
    Female science teacher and girl student writing at whiteboard in classroom
    Side view of multi-ethnic group of high school teenagers in a school classroom sitting at desks, all raising their hands to answer a question — Stock Photo
    Side view of multi-ethnic group of high school teenagers in a school classroom sitting at desks, all raising their hands to answer a question
    Front view of a Caucasian teenage boy standing on stage holding a script in an empty school theatre during rehearsals for a performance — Stock Photo
    Front view of a Caucasian teenage boy standing on stage holding a script in an empty school theatre during rehearsals for a performance
    Secondary tuberculosis lungs infection and close-up of Mycobacterium tuberculosis bacteria. — Stock Photo
    Secondary tuberculosis lungs infection and close-up of Mycobacterium tuberculosis bacteria.
    Front view of a multi-ethnic team of teenage male field hockey players preparing before a game, standing on the pitch in a row, wearing their team strip, holding their hockey sticks, looking to camera on a sunny day — Stock Photo
    Front view of a multi-ethnic team of teenage male field hockey players preparing before a game, standing on the pitch in a row, wearing their team strip, holding their hockey sticks, looking to camera on a sunny day
    College students studying together at desk in classroom — Stock Photo
    College students studying together at desk in 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
    Male teacher and smiling girl student conducting scientific experiment at microscope in laboratory classroom — Stock Photo
    Male teacher and smiling girl student conducting scientific experiment at microscope in laboratory classroom
    Side view of a multi-ethnic group of teenage male and female choristers holding sheet music and singing standing on the stage of a school theatre during rehearsals for a performance — Stock Photo
    Side view of a multi-ethnic group of teenage male and female choristers holding sheet music and singing standing on the stage of a school theatre during rehearsals for a performance
    Side view of a multi-ethnic group of teenage male and female musicians sitting in a classroom talking during a break in their school band practice — Stock Photo
    Side view of a multi-ethnic group of teenage male and female musicians sitting in a classroom talking during a break in their school band practice
    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 close up of a Caucasian teenage boy sitting at a desk in a school classroom looking out of the window, with classmates sitting at desks working in the background — Stock Photo
    Front view close up of a Caucasian teenage boy sitting at a desk in a school classroom looking out of the window, with classmates sitting at desks working in the background
    Close up focused, attentive high school girl student listening in classroom — Stock Photo
    Close up focused, attentive high school girl student listening in classroom
    Boy student holding and examining molecular structure — Stock Photo
    Boy student holding and examining molecular structure
    Side view of a group of female Caucasian field hockey players, preparing before a game, huddling, with one player talking to her Caucasian male coach in the foreground, on a sunny day — Stock Photo
    Side view of a group of female Caucasian field hockey players, preparing before a game, huddling, with one player talking to her Caucasian male coach in the foreground, on a sunny day
    Side view of young male student studying at desk by window in classroom — Stock Photo
    Side view of young male student studying at desk by window in classroom
    High school students with hands raised during lesson in classroom — Stock Photo
    High school students with hands raised during lesson in classroom
    High school students clapping for classmate in debate class — Stock Photo
    High school students clapping for classmate in debate class
    Girl student using microscope, conducting scientific experiment in laboratory classroom — Stock Photo
    Girl student using microscope, conducting scientific experiment in laboratory classroom
    Students writing their GCSE exam in classroom — Stock Photo
    Students writing their GCSE exam in classroom
    High school girls ascending stairs — Stock Photo
    High school girls ascending stairs
    Female university student using digital tablet while studying at desk in classroom — Stock Photo
    Female university student using digital tablet while studying at desk in classroom
    Male teacher using laptop with students in the classroom at school — Stock Photo
    Male teacher using laptop with students in the classroom at school
    Students programming at computer in computer lab classroom — Stock Photo
    Students programming at computer in computer lab 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
    Teenagers playing pool in community center — Stock Photo
    Teenagers playing pool in community center
    Young university students practicing chemistry experiment in lab — Stock Photo
    Young university students practicing chemistry experiment in lab
    Junior high students using computers in computer lab — Stock Photo
    Junior high students using computers in computer lab
    Junior high school boy opening notebook at desk in classroom — Stock Photo
    Junior high school boy opening notebook at desk in classroom
    Junior high boy students walking in library — Stock Photo
    Junior high boy students walking in library
    Schoolkids using digital tablet in classroom at school — Stock Photo
    Schoolkids using digital tablet in classroom at school
    Female student using desktop computer while sitting by window in classroom — Stock Photo
    Female student using desktop computer while sitting by window in classroom
    Side view of teenage girl reading book while sitting by shelf in library — Stock Photo
    Side view of teenage girl reading book while sitting by shelf in library
    Portrait of teenage girl with arms crossed standing by desk in lab — Stock Photo
    Portrait of teenage girl with arms crossed standing by desk in lab
    Front view of a multi-ethnic group of teenage male and female high school pupils with schoolbags hanging out, talking and walking down steps in their school grounds — Stock Photo
    Front view of a multi-ethnic group of teenage male and female high school pupils with schoolbags hanging out, talking and walking down steps in their school grounds
    Side view of a mixed race teenage boy and African American teenage girl high school student sitting on chairs in an empty school theatre preparing before a performance, holding scripts and rehearsing together — Stock Photo
    Side view of a mixed race teenage boy and African American teenage girl high school student sitting on chairs in an empty school theatre preparing before a performance, holding scripts and rehearsing together
    Rear view of a teenage Caucasian male field hockey goalkeeper in action on the pitch, diving to stop a ball with a hockey stick, during a hockey match between two multi-ethnic teenage male teams on a sunny day, seen through the goal net — Stock Photo
    Rear view of a teenage Caucasian male field hockey goalkeeper in action on the pitch, diving to stop a ball with a hockey stick, during a hockey match between two multi-ethnic teenage male teams on a sunny day, seen through the goal net
    Students talking at table in library — Stock Photo
    Students talking at table in library
    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
    Group portrait of schoolchildren wearing school uniforms standing in corridor and smiling — Stock Photo
    Group portrait of schoolchildren wearing school uniforms standing in corridor and smiling
    Female teacher helping junior high school students doing homework at desk in classroom — Stock Photo
    Female teacher helping junior high school students doing homework at desk in classroom
    National flags hanging above tables in classroom — Stock Photo
    National flags hanging above tables in classroom
    Young college students discussing while standing in library — Stock Photo
    Young college students discussing while standing in library
    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 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
    Side view of a teenage Caucasian male field hockey player, standing alone in a corridor wearing a helmet, preparing and focusing before a game — Stock Photo
    Side view of a teenage Caucasian male field hockey player, standing alone in a corridor wearing a helmet, preparing and focusing before a game
    Students using laptop in the classroom at school — Stock Photo
    Students using laptop in the classroom at school
    Junior high school students studying at desk in classroom — Stock Photo
    Junior high school students studying at desk in classroom
    Elevated view of lone female student writing their GCSE exam in classroom — Stock Photo
    Elevated view of lone female student writing their GCSE exam in classroom
    Portrait close up of a Caucasian male field hockey goalkeeper, wearing black hockey uniform and a helmet, standing on the pitch and looking to camera, with his teammates in the background on a sunny day — Stock Photo
    Portrait close up of a Caucasian male field hockey goalkeeper, wearing black hockey uniform and a helmet, standing on the pitch and looking to camera, with his teammates in the background on a sunny day
    High school girl student raising hand, asking question during lesson in classroom — Stock Photo
    High school girl student raising hand, asking question during lesson in classroom
    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
    High school students studying at tables in classroom — Stock Photo
    High school students studying at tables in classroom
    Portrait of confident teachers in library with students — Stock Photo
    Portrait of confident teachers in library with students
    Focused boy student reading textbook at microscope in laboratory classroom — Stock Photo
    Focused boy student reading textbook at microscope in laboratory classroom