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    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.
    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 a group of female Caucasian field hockey players and their Caucasian male coach training before a game, standing on a stand, resting, listening to their coach, on a sunny day — Stock Photo
    Side view of a group of female Caucasian field hockey players and their Caucasian male coach training before a game, standing on a stand, resting, listening to their coach, on a sunny day
    Rear view of a Caucasian male field hockey coach interacting with a multi-ethnic group of teenage male field hockey players, sitting in the changing room, discussing the game — Stock Photo
    Rear view of a Caucasian male field hockey coach interacting with a multi-ethnic group of teenage male field hockey players, sitting in the changing room, discussing the game
    High school boy student with backpack leaving classroom — Stock Photo
    High school boy student with backpack leaving classroom
    Teenage boys spray painting in high school art class — Stock Photo
    Teenage boys spray painting in high school art class
    Schoolboy writing on chalkboard in classroom at school — Stock Photo
    Schoolboy writing on chalkboard in classroom at school
    Female student reading book while standing by shelf in library — Stock Photo
    Female student reading book while standing by shelf in library
    Junior high school boy students using digital tablets at desk in classroom — Stock Photo
    Junior high school boy students using digital tablets at desk in classroom
    Close up detail of a field hockey equipment, helmet glove and ball lying on a hockey pitch on a sunny day — Stock Photo
    Close up detail of a field hockey equipment, helmet glove and ball lying on a hockey pitch on a sunny day
    Portrait confident junior high girl student in library — Stock Photo
    Portrait confident junior high girl student in library
    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 and smiling — 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 and smiling
    Boy playing table tennis — Stock Photo
    Boy playing table tennis
    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
    Surprised students conducting scientific experiment, watching chemical reaction in classroom laboratory — Stock Photo
    Surprised students conducting scientific experiment, watching chemical reaction in classroom laboratory
    Schoolboy standing in the classroom at school — Stock Photo
    Schoolboy standing in the classroom at school
    Male teacher helping students assembling robotics in classroom — Stock Photo
    Male teacher helping students assembling robotics in classroom
    Rear view of a Caucasian male high school teacher sitting on a chair on the stage in an empty school theatre and pointing during rehearsals for a performance, preparing a multi-ethnic group of teenage high school students for a performance — Stock Photo
    Rear view of a Caucasian male high school teacher sitting on a chair on the stage in an empty school theatre and pointing during rehearsals for a performance, preparing a multi-ethnic group of teenage high school students for a performance
    Focused students using computer in dark classroom — Stock Photo
    Focused students using computer in dark classroom
    Smiling female science teacher and girl student reading textbook at microscope in laboratory classroom — Stock Photo
    Smiling female science teacher and girl student reading textbook at microscope in laboratory classroom
    Junior high girl students entering library — Stock Photo
    Junior high girl students entering library
    Schoolgirl standing near chalkboard in classroom at school — Stock Photo
    Schoolgirl standing near chalkboard in classroom at school
    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
    Side view of a Caucasian teenage boy standing on stage holding a script in an empty school theatre during rehearsals for a performance — Stock Photo
    Side view of a Caucasian teenage boy standing on stage holding a script in an empty school theatre during rehearsals for a performance
    Front view close up of a Caucasian teenage female high school pupil, using a tablet and sitting on steps in the school grounds — Stock Photo
    Front view close up of a Caucasian teenage female high school pupil, using a tablet and sitting on steps in the school grounds
    Front view of a multi-ethnic group of teenage male and female school pupils with schoolbags hanging out, walking and talking in their high school grounds — Stock Photo
    Front view of a multi-ethnic group of teenage male and female school pupils with schoolbags hanging out, walking and talking in their high school grounds
    Schoolgirl explaining about world map in classroom at school — Stock Photo
    Schoolgirl explaining about world map in classroom at school
    Side view of a group of female Caucasian field hockey players, training before a game, working out on a field hockey pitch, doing push ups, 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, doing push ups, on a sunny day
    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
    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).
    Focused girl students soldering circuit boards in classroom — Stock Photo
    Focused girl students soldering circuit boards in classroom
    Teenage female student using digital tablet in desk in classroom — Stock Photo
    Teenage female student using digital tablet in desk in classroom
    Rear view of a group of female Caucasian field hockey players, preparing before a game, standing in a row embracing, concentrating, on a sunny day — Stock Photo
    Rear view of a group of female Caucasian field hockey players, preparing before a game, standing in a row embracing, concentrating, on a sunny day
    Teenage girl using digital tablet while sitting in library — Stock Photo
    Teenage girl using digital tablet while sitting in library
    Schoolboy writing on chalkboard in classroom at school — Stock Photo
    Schoolboy writing on chalkboard in classroom at school
    Female college student using microscope while practicing experiment in lab — Stock Photo
    Female college student using microscope while practicing experiment in lab
    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
    Female teacher and girl students using microscope and laptop, conducting scientific experiment in laboratory classroom — Stock Photo
    Female teacher and girl students using microscope and laptop, conducting scientific experiment in laboratory classroom
    Portrait confident junior high female students on steps — Stock Photo
    Portrait confident junior high female students on steps
    Smiling junior high school students listening in classroom lesson — Stock Photo
    Smiling junior high school students listening in classroom lesson
    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.
    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
    Portrait confident female teacher at projection screen in classroom — Stock Photo
    Portrait confident female teacher at projection screen in classroom
    Male teacher teaching students in the classroom at school — Stock Photo
    Male teacher teaching students in the classroom at school
    Teenage female practicing chemistry experiment in lab — Stock Photo
    Teenage female practicing chemistry experiment in lab
    Girl students studying at computers in library — Stock Photo
    Girl students studying at computers in library
    Side view of a Caucasian female field hockey player, during a field hockey game, running with a ball, holding a hockey stick, with her teammates and opponents in the background, on a sunny day — Stock Photo
    Side view of a Caucasian female field hockey player, during a field hockey game, running with a ball, holding a hockey stick, with her teammates and opponents in the background, on a sunny day
    Male teacher using digital tablet with students in classroom at school — Stock Photo
    Male teacher using digital tablet with students in classroom at school
    Young woman in wheelchair getting out of elevator — Stock Photo
    Young woman in wheelchair getting out of elevator
    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
    France, Northern France, Pas de Calais. Calais. Community gardens. — Stock Photo
    France, Northern France, Pas de Calais. Calais. Community gardens.
    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
    Side view close up of two Caucasian teenage girls with long dark hair sitting in front of a window playing a flute and a ukulele — Stock Photo
    Side view close up of two Caucasian teenage girls with long dark hair sitting in front of a window playing a flute and a ukulele
    High school students clapping for classmate in debate class — Stock Photo
    High school students clapping for classmate in debate class
    Curious, smiling girl students listening in classroom — Stock Photo
    Curious, smiling girl students listening in classroom
    Side view close up of a Caucasian female field hockey player, preparing before a game, standing in a changing room, with her teammates standing in a row behind her — Stock Photo
    Side view close up of a Caucasian female field hockey player, preparing before a game, standing in a changing room, with her teammates standing in a row behind her
    Focused junior high school student doing homework in classroom — Stock Photo
    Focused junior high school student doing homework in classroom
    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
    Secondary follicles in an ovary — Stock Photo
    Secondary follicles in an ovary
    Portrait of enthusiastic junior high students and teachers cheering — Stock Photo
    Portrait of enthusiastic junior high students and teachers cheering