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    Secondary tuberculosis lungs infection and close-up of Mycobacterium tuberculosis bacteria. — Stock Photo
    Secondary tuberculosis lungs infection and close-up of Mycobacterium tuberculosis bacteria.
    Smiling teenage girl keeping book in shelf in library — Stock Photo
    Smiling teenage girl keeping book in shelf in library
    Portrait close up of a teenage Caucasian male field hockey player, wearing a red team strip, standing in the changing room, looking straight to camera, focusing before a game — Stock Photo
    Portrait close up of a teenage Caucasian male field hockey player, wearing a red team strip, standing in the changing room, looking straight to camera, focusing before a game
    Close up profile girl student using microscope, conducting scientific experiment — Stock Photo
    Close up profile girl student using microscope, conducting scientific experiment
    Students soldering circuit board in classroom — Stock Photo
    Students soldering circuit board in classroom
    High school students watching female teacher leading lesson at projection screen in classroom — Stock Photo
    High school students watching female teacher leading lesson at projection screen in classroom
    Digital molecular model of secondary structure of immunoglobulin G antibody. — Stock Photo
    Digital molecular model of secondary structure of immunoglobulin G antibody.
    Front view of a multi-ethnic group of teenage pupils standing together in a classroom and smiling to camera at break time — Stock Photo
    Front view of a multi-ethnic group of teenage pupils standing together in a classroom and smiling to camera at break time
    Portrait of smiling, confident junior high school student studying at desk in classroom — Stock Photo
    Portrait of smiling, confident junior high school student studying at desk in classroom
    Female college student showing tablet computer to classmate while standing in library — Stock Photo
    Female college student showing tablet computer to classmate while standing in library
    High school girl students talking, doing homework in classroom — Stock Photo
    High school girl students talking, doing homework in classroom
    Front view of two Caucasian teenage female school pupils with schoolbags hanging out, walking and looking at a smartphone together in their high school grounds, with classmates hanging out in the background — Stock Photo
    Front view of two Caucasian teenage female school pupils with schoolbags hanging out, walking and looking at a smartphone together in their high school grounds, with classmates hanging out in the background
    Side view of a mixed race teenage male high school student in an empty school theatre during rehearsals for a performance, standing on the stage holding a script and practicing his part, with other pupils holding scripts in the background — Stock Photo
    Side view of a mixed race teenage male high school student in an empty school theatre during rehearsals for a performance, standing on the stage holding a script and practicing his part, with other pupils holding scripts in the background
    Portrait of a Caucasian female field hockey players, preparing before a game, standing in a changing room, with her teammates standing in a row behind her — Stock Photo
    Portrait of a Caucasian female field hockey players, preparing before a game, standing in a changing room, with her teammates standing in a row behind her
    Tween boys with basketball in schoolyard — Stock Photo
    Tween boys with basketball in schoolyard
    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
    Side view of a multi-ethnic group of teenage male field hockey players, training before a game, working out with their coach on a field hockey pitch, running on a sunny day — Stock Photo
    Side view of a multi-ethnic group of teenage male field hockey players, training before a game, working out with their coach on a field hockey pitch, running on a sunny day
    Portrait of a teenage mixed race male field hockey player, wearing a red team strip, standing on a field hockey pitch, looking to camera, focusing before a game, with his teammates in the background on a sunny day — Stock Photo
    Portrait of a teenage mixed race male field hockey player, wearing a red team strip, standing on a field hockey pitch, looking to camera, focusing before a game, with his teammates in the background on a sunny day
    Front 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
    Front 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
    Teenage girl with hand on chin using tablet computer while sitting at desk in classroom — Stock Photo
    Teenage girl with hand on chin using tablet computer while sitting at desk in classroom
    Portrait of smiling, confident male teacher in classroom — Stock Photo
    Portrait of smiling, confident male teacher in classroom
    High school students clapping for classmate in debate class — Stock Photo
    High school students clapping for classmate in debate class
    Male teacher and students watching chemical reaction, conducting scientific experiment in laboratory classroom — Stock Photo
    Male teacher and students watching chemical reaction, conducting scientific experiment in laboratory classroom
    Side view of a multi-ethnic group of teenage male and female high school pupils with schoolbags hanging out, walking and talking in their high school grounds — Stock Photo
    Side view of a multi-ethnic group of teenage male and female high school pupils with schoolbags hanging out, walking and talking in their high school grounds
    Male teacher teaching students in the classroom at school — Stock Photo
    Male teacher teaching students in the classroom at school
    Female teacher in hijab leading lesson at projection screen in classroom — Stock Photo
    Female teacher in hijab leading lesson at projection screen in classroom
    Human ovary structure — Stock Photo
    Human ovary structure
    Male high school teacher helping boy student with homework in classroom — Stock Photo
    Male high school teacher helping boy student with homework in classroom
    Portrait of smiling, confident junior high student using computer in computer lab — Stock Photo
    Portrait of smiling, confident junior high student using computer in computer lab
    Over the shoulder view of a Caucasian female conductor and a multi-ethnic group of teenage male and female choristers standing opposite each other, the choir holding sheet music and singing — Stock Photo
    Over the shoulder view of a Caucasian female conductor and a multi-ethnic group of teenage male and female choristers standing opposite each other, the choir holding sheet music and singing
    Side view 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 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
    Side view mid section of musician teenage girl sitting by a window in a shadow and playing a ukulele — Stock Photo
    Side view mid section of musician teenage girl sitting by a window in a shadow and playing a ukulele
    Front view 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 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
    Enthusiastic female teacher and junior high school students in classroom — Stock Photo
    Enthusiastic female teacher and junior high school students in classroom
    Front view of a multi-ethnic group of teenage school pupils standing together in a classroom looking at a tablet computer and smiling at break time — Stock Photo
    Front view of a multi-ethnic group of teenage school pupils standing together in a classroom looking at a tablet computer and smiling at break time
    Teenagers with microphone and video camera vlogging — Stock Photo
    Teenagers with microphone and video camera vlogging
    Digital molecular model of secondary structure of immunoglobulin G antibodies. — Stock Photo
    Digital molecular model of secondary structure of immunoglobulin G antibodies.
    Happy, smiling high school girl student talking with classmate in classroom — Stock Photo
    Happy, smiling high school girl student talking with classmate in classroom
    Focused girl student assembling circuit board in classroom — Stock Photo
    Focused girl student assembling circuit board in classroom
    Front view of a multi-ethnic group of teenage male and female high school students with schoolbags hanging out, standing and hand stacking in their school grounds — Stock Photo
    Front view of a multi-ethnic group of teenage male and female high school students with schoolbags hanging out, standing and hand stacking in their school grounds
    Young college students discussing while standing in library — Stock Photo
    Young college students discussing while standing in library
    Thoughtful young college student studying at desk in classroom — Stock Photo
    Thoughtful young college student studying at desk in classroom
    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
    Portrait of smiling, confident junior high school girl writing in notebook in classroom — Stock Photo
    Portrait of smiling, confident junior high school girl writing in notebook in classroom
    Front view of a multi-ethnic group of high school teenage male and female school pupils in a classroom, sitting at a table working together, looking at a laptop computer — Stock Photo
    Front view of a multi-ethnic group of high school teenage male and female school pupils in a classroom, sitting at a table working together, looking at a laptop computer
    University students performing experiment in lab — Stock Photo
    University students performing experiment in lab
    Front view of an male Caucasian teacher standing and talking to a Caucasian male student in a multi-ethnic class of teenagers in a high school classroom sitting at desks and working — Stock Photo
    Front view of an male Caucasian teacher standing and talking to a Caucasian male student in a multi-ethnic class of teenagers in a high school classroom sitting at desks and working
    Female teacher and students programming and assembling robotics in classroom — Stock Photo
    Female teacher and students programming and assembling robotics in classroom
    Side view of a Caucasian male high school teacher sitting on a chair on the stage in an empty school theatre during rehearsals for a performance, preparing a multi-ethnic group of teenager high school students for a performance — Stock Photo
    Side view of a Caucasian male high school teacher sitting on a chair on the stage in an empty school theatre during rehearsals for a performance, preparing a multi-ethnic group of teenager high school students for a performance
    Schoolkids looking at globe in classroom at school — Stock Photo
    Schoolkids looking at globe in classroom at school
    Side view of young female student using microscope in lab — Stock Photo
    Side view of young female student using microscope in lab
    Side view of a teenage African American girl in a high school classroom sitting on a desk, concentrating and writing, with teenage male and female classmates sitting at desks working in the background — Stock Photo
    Side view of a teenage African American girl in a high school classroom sitting on a desk, concentrating and writing, with teenage male and female classmates sitting at desks working in the background
    Teenage girl showing tablet computer to friend while standing in library — Stock Photo
    Teenage girl showing tablet computer to friend while standing in library
    Girl students using microscope, conducting scientific experiment in laboratory classroom — Stock Photo
    Girl students using microscope, conducting scientific experiment in laboratory classroom
    Confident high school boy student giving presentation in classroom — Stock Photo
    Confident high school boy student giving presentation in classroom
    Front view of a Caucasian male field hockey coach holding a clipboard, surrounded by a multi-ethnic group of teenage male field hockey players, listening to him on a sunny day while he explains a game plan, preparing his team for a match — Stock Photo
    Front view of a Caucasian male field hockey coach holding a clipboard, surrounded by a multi-ethnic group of teenage male field hockey players, listening to him on a sunny day while he explains a game plan, preparing his team for a match
    Female geography teacher with globe teaching lesson in classroom — Stock Photo
    Female geography teacher with globe teaching lesson in classroom
    Thoughtful schoolkid sitting in the classroom at school — Stock Photo
    Thoughtful schoolkid sitting in the classroom at school
    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).
    Schoolboy writing on chalkboard in classroom at school — Stock Photo
    Schoolboy writing on chalkboard in classroom at school