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    High school students with hands raised during lesson in classroom — Stock Photo
    High school students with hands raised during lesson in classroom
    Front view of a male Caucasian teacher standing, holding a tablet computer 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, holding a tablet computer and talking to a multi-ethnic group of teenagers in a school high school classroom sitting at desks and listening
    Junior high school boys watching teacher during lesson in classroom — Stock Photo
    Junior high school boys watching teacher during lesson in classroom
    Schoolgirl writing on chalkboard in classroom at school — Stock Photo
    Schoolgirl writing on chalkboard in classroom at school
    College students studying at desk in classroom — Stock Photo
    College students studying at desk in classroom
    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
    Front view of a teenage African American girl in a school classroom sitting at desk, concentrating and reading, with teenage male classmates sitting at desks working in the background — Stock Photo
    Front view of a teenage African American girl in a school classroom sitting at desk, concentrating and reading, with teenage male classmates sitting at desks working in the background
    Portrait confident junior high female students on steps — Stock Photo
    Portrait confident junior high female students on steps
    High school teacher leading geography lesson at projection screen in classroom — Stock Photo
    High school teacher leading geography lesson at projection screen in classroom
    Side view low section close up of a group of female Caucasian field hockey players preparing before a game, sitting in a changing room, tying their shoes — Stock Photo
    Side view low section close up of a group of female Caucasian field hockey players preparing before a game, sitting in a changing room, tying their shoes
    France, Southern France, Vileveyrac, Cistercian abbey of Holy Mary of Valmagne, 13th century, gothic style, nave 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 nave turned into a wine storehouse after the Revolution
    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
    Curious girl examining molecule model in classroom — Stock Photo
    Curious girl examining molecule model in classroom
    Portrait confident male high school teacher in classroom — Stock Photo
    Portrait confident male high school teacher in classroom
    Cropped image of teenage girl using smartphone at desk in classroom — Stock Photo
    Cropped image of teenage girl using smartphone at desk in classroom
    Young college students at desks by window in classroom — Stock Photo
    Young college students at desks by window in classroom
    Male teacher helping junior high school students at desk in classroom — Stock Photo
    Male teacher helping junior high school students at desk in classroom
    Portrait smiling, confident junior high school girl in classroom — Stock Photo
    Portrait smiling, confident junior high school girl in classroom
    Focused teenage boy with clipboard vlogging — Stock Photo
    Focused teenage boy with clipboard vlogging
    Side view of a mixed race teenage male high school student in a classroom, working on a computer and concentrating, with other pupils working on computers in the background — Stock Photo
    Side view of a mixed race teenage male high school student in a classroom, working on a computer and concentrating, with other pupils working on computers in the background
    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
    Boys with basketball ball on schoolyard — Stock Photo
    Boys with basketball ball on schoolyard
    Teenage female wearing safety glasses while practicing science experiment in lab — Stock Photo
    Teenage female wearing safety glasses while practicing science experiment in lab
    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
    Curious, smiling students watching chemical reaction, conducting scientific experiment in laboratory classroom — Stock Photo
    Curious, smiling students watching chemical reaction, conducting scientific experiment in laboratory classroom
    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.
    High angle front view of a Caucasian teenage boy sitting at a desk in a school classroom looking away, thinking, classmates sitting at desks in the background — Stock Photo
    High angle front view of a Caucasian teenage boy sitting at a desk in a school classroom looking away, thinking, classmates sitting at desks in the background
    Female teacher and girl students examining molecular structure in classroom — Stock Photo
    Female teacher and girl students examining molecular structure in classroom
    Side view of a Caucasian male field hockey coach interacting with a group of female Caucasian field hockey players, sitting in a changing room, showing them a game plan — Stock Photo
    Side view of a Caucasian male field hockey coach interacting with a group of female Caucasian field hockey players, sitting in a changing room, showing them a game plan
    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
    Secondary follicles in an ovary — Stock Photo
    Secondary follicles in an ovary
    Front view close up of a Caucasian teenage boy musician with grey t-shirt sitting in front of a window playing a trombone at school — Stock Photo
    Front view close up of a Caucasian teenage boy musician with grey t-shirt sitting in front of a window playing a trombone at school
    Young male college student studying at desk in classroom — Stock Photo
    Young male college student studying at desk 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 leading lesson at touch screen in classroom — Stock Photo
    Male teacher leading lesson at touch screen in classroom
    Junior high school students with hands raised in classroom — Stock Photo
    Junior high school students with hands raised in classroom
    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.
    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
    High school students clapping for classmate in debate class — Stock Photo
    High school students clapping for classmate in debate class
    Junior high students talking — Stock Photo
    Junior high students talking
    Surprised students conducting scientific experiment, watching chemical reaction in classroom laboratory — Stock Photo
    Surprised students conducting scientific experiment, watching chemical reaction in classroom laboratory
    Girl student examining DNA model in classroom — Stock Photo
    Girl student examining DNA model in classroom
    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
    Secondary carcinoma of the lung — Stock Photo
    Secondary carcinoma of the lung
    High angle view of university students studying at desk in classroom — Stock Photo
    High angle view of university students studying at desk in classroom
    Female students performing chemistry experiment in lab — Stock Photo
    Female students performing chemistry experiment in lab
    Front view close up of a Caucasian teenage boy musician with brown shirt sitting in front of a window playing a French horn alone at school — Stock Photo
    Front view close up of a Caucasian teenage boy musician with brown shirt sitting in front of a window playing a French horn alone at school
    Teenage girl using laptop computer while sitting in classroom — Stock Photo
    Teenage girl using laptop computer while sitting in classroom
    Two smiling female students looking at mobile phone in school corridor — Stock Photo
    Two smiling female students looking at mobile phone in school corridor
    Secondary liver cancer — Stock Photo
    Secondary liver cancer
    Side view close up of a teenage multi-ethnic group of male field hockey players in a huddle in the changing room, preparing before a game, focusing — Stock Photo
    Side view close up of a teenage multi-ethnic group of male field hockey players in a huddle in the changing room, preparing before a game, focusing
    Side 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
    Side 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
    Portrait of smiling, confident junior student carrying books in library — Stock Photo
    Portrait of smiling, confident junior student carrying books in library
    Front view of a multi-ethnic group of high school teenage male and female high school pupils in a classroom, sitting at desks working together and talking — Stock Photo
    Front view of a multi-ethnic group of high school teenage male and female high school pupils in a classroom, sitting at desks working together and talking
    Smiling students using digital tablet in classroom — Stock Photo
    Smiling students using digital tablet in classroom
    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).
    High school teacher calling on students during lesson in classroom — Stock Photo
    High school teacher calling on students during lesson in classroom
    Focused boy student programming at computer in dark classroom — Stock Photo
    Focused boy student programming at computer in dark classroom
    Happy high school students and teacher clapping in debate class — Stock Photo
    Happy high school students and teacher clapping in debate class
    France, central Southern France, The regional natural park of Haut-Languedoc, la Montagne Noire — Stock Photo
    France, central Southern France, The regional natural park of Haut-Languedoc, la Montagne Noire