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    Schoolboy writing on chalkboard in classroom at school — Stock Photo
    Schoolboy writing on chalkboard in classroom at school
    Male student reading record while practicing chemistry experiment in lab — Stock Photo
    Male student reading record while practicing chemistry experiment in lab
    Secondary liver cancer — Stock Photo
    Secondary liver cancer
    Side view of a group of female Caucasian field hockey players, preparing before a game, huddling, interacting, motivating, bending down, on a sunny day — Stock Photo
    Side view of a group of female Caucasian field hockey players, preparing before a game, huddling, interacting, motivating, bending down, on a sunny day
    Junior high students talking — Stock Photo
    Junior high students talking
    Female college students practicing chemistry experiment in lab — Stock Photo
    Female college students practicing chemistry experiment in lab
    High school boy students talking in classroom — Stock Photo
    High school boy students talking in classroom
    Girl practicing science experiment in laboratory — Stock Photo
    Girl practicing science experiment in laboratory
    Young college students studying at desk in calssroom — Stock Photo
    Young college students studying at desk in calssroom
    Portrait of confident junior high school student leaving classroom — Stock Photo
    Portrait of confident junior high school student leaving classroom
    Girl students studying at computers in library — Stock Photo
    Girl students studying at computers in library
    Serious boy student holding molecular structure in classroom — Stock Photo
    Serious boy student holding molecular structure in classroom
    Teenage girl looking at computer while sitting at desk in lab — Stock Photo
    Teenage girl looking at computer while sitting at desk in lab
    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
    High school students with hands raised in debate class — Stock Photo
    High school students with hands raised in debate class
    Front view of a group of female Caucasian field hockey players and their Caucasian male coach training before a game, standing on a stand, resting, drinking water, on a sunny day — Stock Photo
    Front view of a group of female Caucasian field hockey players and their Caucasian male coach training before a game, standing on a stand, resting, drinking water, on a sunny day
    Close up profile girl student using microscope, conducting scientific experiment — Stock Photo
    Close up profile girl student using microscope, conducting scientific experiment
    Male teacher leading lesson at projection screen in classroom — Stock Photo
    Male teacher leading lesson at projection screen 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
    Young female using tablet computer while studying at desk with classmates at desk in classroom — Stock Photo
    Young female using tablet computer while studying at desk with classmates at desk in classroom
    Front view close up of a teenage mixed-race boy in a school classroom sitting at desk, concentrating and using tablet computer, with teenage male and female classmates sitting at desks working in the background — Stock Photo
    Front view close up of a teenage mixed-race boy in a school classroom sitting at desk, concentrating and using tablet computer, with teenage male and female classmates sitting at desks working in the background
    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
    Metastatic breast cancer — Stock Photo
    Metastatic breast cancer
    Closeup on lettuce grown on an above-ground tray. — Stock Photo
    Closeup on lettuce grown on an above-ground tray.
    Junior high students using computer in computer lab — Stock Photo
    Junior high students using computer in computer lab
    Side view close up of a Caucasian female conductor directing a 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 close up of a Caucasian female conductor directing a 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
    High school girl students with hands raised during lesson in classroom — Stock Photo
    High school girl students with hands raised during lesson in classroom
    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
    High angle view of teenage girl practicing experiment in lab — Stock Photo
    High angle view of teenage girl practicing experiment in lab
    Mid section of teenage girl practicing at desk in classroom — Stock Photo
    Mid section of teenage girl practicing at desk in classroom
    Close-up of teenage girl using microscope in lab — Stock Photo
    Close-up of teenage girl using microscope in lab
    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 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
    Female students using computer while practicing experiment in lab — Stock Photo
    Female students using computer while practicing experiment in lab
    High school girls descending stairs — Stock Photo
    High school girls descending stairs
    Schoolkids holding sketch pens in classroom at school — Stock Photo
    Schoolkids holding sketch pens in classroom at school
    Junior high school student using virtual reality simulator glasses in classroom — Stock Photo
    Junior high school student using virtual reality simulator glasses in classroom
    Front view mid section of female and male high school student couple hanging out and holding hands, standing in their school playing field — Stock Photo
    Front view mid section of female and male high school student couple hanging out and holding hands, standing in their school playing field
    Students writing their GCSE exam — Stock Photo
    Students writing their GCSE exam
    Front view of a Caucasian teenage female high school student using a smartphone and walking in the school grounds — Stock Photo
    Front view of a Caucasian teenage female high school student using a smartphone and walking in the school grounds
    Teenagers playing pool at school — Stock Photo
    Teenagers playing pool at school
    Digital molecular model of secondary structure of immunoglobulin G antibodies. — Stock Photo
    Digital molecular model of secondary structure of immunoglobulin G antibodies.
    Teacher and students during chemistry lesson, wearing protective eyewear and looking at test tubes — Stock Photo
    Teacher and students during chemistry lesson, wearing protective eyewear and looking at test tubes
    High school students talking in debate class at table in classroom — Stock Photo
    High school students talking in debate class at table in classroom
    View of boy programming at computer in classroom on digital camera viewfinder — Stock Photo
    View of boy programming at computer in classroom on digital camera viewfinder
    Female teacher in hijab teaching lesson at projection screen in classroom — Stock Photo
    Female teacher in hijab teaching lesson at projection screen in classroom
    Female student reading book while standing by shelf in library — Stock Photo
    Female student reading book while standing by shelf in library
    Girl student conducting scientific experiment in laboratory classroom — Stock Photo
    Girl student conducting scientific experiment in laboratory classroom
    Students researching at computers in library — Stock Photo
    Students researching at computers in library
    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
    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
    Broom stem. Light micrograph (LM) of transverse section through stem of common broom (Salicornia europaea) plant. Broom is drought plant (xerophyte) with ribbed stems and branches to increase area for photosynthesis — Stock Photo
    Broom stem. Light micrograph (LM) of transverse section through stem of common broom (Salicornia europaea) plant. Broom is drought plant (xerophyte) with ribbed stems and branches to increase area for photosynthesis
    Portrait of teenage girl holding tablet while sitting by machinery in lab — Stock Photo
    Portrait of teenage girl holding tablet while sitting by machinery in lab
    Tween boys playing basketball on schoolyard — Stock Photo
    Tween boys playing basketball on schoolyard
    Junior high girl students entering library — Stock Photo
    Junior high girl students entering library
    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 playing with a ball 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 playing with a ball in the background on a sunny day
    Portrait smiling, confident girl students researching at computer in library — Stock Photo
    Portrait smiling, confident girl students researching at computer in library
    Teenagers spray painting in art class — Stock Photo
    Teenagers spray painting in art class
    Male teacher and girl students conducting scientific experiment at microscope in laboratory classroom — Stock Photo
    Male teacher and girl students conducting scientific experiment at microscope in laboratory classroom
    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