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    Junior high school girl student doing homework at desk in classroom — Stock Photo
    Junior high school girl student doing homework at desk in classroom
    Young university students at desk in classroom — Stock Photo
    Young university students at desk 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).
    Rear view of a Caucasian male field hockey coach interacting with a group of female Caucasian field hockey players, sitting in a changing room — Stock Photo
    Rear view of a Caucasian male field hockey coach interacting with a group of female Caucasian field hockey players, sitting in a changing room
    Secondary liver cancer — Stock Photo
    Secondary liver cancer
    Side view close up of a teenage mixed-race boy in a school classroom sitting at desk, concentrating, with teenage male and female classmates sitting at desks working in the background — Stock Photo
    Side view close up of a teenage mixed-race boy in a school classroom sitting at desk, concentrating, with teenage male and female classmates sitting at desks working in the background
    Male teacher and students researching at computer in library — Stock Photo
    Male teacher and students researching at computer in library
    Schoolboy writing on chalkboard in classroom at school — Stock Photo
    Schoolboy writing on chalkboard in classroom at school
    Schoolkids using laptop in classroom at school — Stock Photo
    Schoolkids using laptop in classroom at school
    University students sitting at table during exam in classroom — Stock Photo
    University students sitting at table during exam in classroom
    Male teacher leading physics lesson at whiteboard in classroom — Stock Photo
    Male teacher leading physics lesson at whiteboard in classroom
    High angle mid section of musician teenage girl wearing a striped sweater sitting and playing a ukulele alone — Stock Photo
    High angle mid section of musician teenage girl wearing a striped sweater sitting and playing a ukulele alone
    Side view of a Caucasian teenage male high school student and a Caucasian male teacher standing on the stage in an empty school theatre preparing before a performance, holding scripts and practicing together, backlit by spotlights — Stock Photo
    Side view of a Caucasian teenage male high school student and a Caucasian male teacher standing on the stage in an empty school theatre preparing before a performance, holding scripts and practicing together, backlit by spotlights
    Portrait of a Caucasian female field hockey player, preparing before a game, standing in a changing room, wearing a hockey helmet, with her teammates standing in a row behind her — Stock Photo
    Portrait of a Caucasian female field hockey player, preparing before a game, standing in a changing room, wearing a hockey helmet, with her teammates standing in a row behind her
    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
    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
    Junior high students using computers in computer lab — Stock Photo
    Junior high students using computers in computer lab
    Junior high students talking in library — Stock Photo
    Junior high students talking in library
    Junior high students talking, hanging out — Stock Photo
    Junior high students talking, hanging out
    Schoolkids looking at each other in school campus on a sunny day — Stock Photo
    Schoolkids looking at each other in school campus on a sunny day
    Student using laptop in the classroom at school — Stock Photo
    Student using laptop in the classroom at school
    Rear view of a multi-ethnic group of male and female teenage students talking as they walk through their school grounds — Stock Photo
    Rear view of a multi-ethnic group of male and female teenage students talking as they walk through their school grounds
    High school teacher leading geography lesson at projection screen in classroom — Stock Photo
    High school teacher leading geography lesson at projection screen in classroom
    Smiling girl conducting scientific experiment in laboratory classroom — Stock Photo
    Smiling girl conducting scientific experiment in laboratory classroom
    Portrait smiling, confident girl student holding robot — Stock Photo
    Portrait smiling, confident girl student holding robot
    Focused girl student assembling circuit board in classroom — Stock Photo
    Focused girl student assembling circuit board in classroom
    High school students and teacher clapping for student in debate class — Stock Photo
    High school students and teacher clapping for student in debate class
    Side view mid section of boy and 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 mid section of boy and girl high school student sitting on chairs in an empty school theatre preparing before a performance, holding scripts and rehearsing together
    Side view of two teams of female Caucasian field hockey players, preparing before a game, huddling, motivating each other, on a sunny day — Stock Photo
    Side view of two teams of female Caucasian field hockey players, preparing before a game, huddling, motivating each other, on a sunny day
    High school teacher helping students studying in classroom — Stock Photo
    High school teacher helping students studying in classroom
    France, Dordogne, plowed fields and forest. Pool of light — Stock Photo
    France, Dordogne, plowed fields and forest. Pool of light
    Portrait happy junior high students and teachers in library — Stock Photo
    Portrait happy junior high students and teachers in library
    Confident junior high school girl student doing homework in classroom — Stock Photo
    Confident junior high school girl student doing homework in classroom
    Front view of a group of female Caucasian field hockey players preparing before a game, standing in a changing room, one is putting her hand on a shoulder of her teammate — Stock Photo
    Front view of a group of female Caucasian field hockey players preparing before a game, standing in a changing room, one is putting her hand on a shoulder of her teammate
    Junior high school students using futuristic touch screen in classroom — Stock Photo
    Junior high school students using futuristic touch screen 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
    Overhead view of a teenage Caucasian girl in a high school classroom sitting at desk, concentrating and writing in her notebook — Stock Photo
    Overhead view of a teenage Caucasian girl in a high school classroom sitting at desk, concentrating and writing in her notebook
    Side view of teenage girl practicing experiment while using microscope in lab — Stock Photo
    Side view of teenage girl practicing experiment while using microscope in lab
    Young college students at desks by window in classroom — Stock Photo
    Young college students at desks by window in classroom
    Science teacher helping girl student at microscope in classroom laboratory — Stock Photo
    Science teacher helping girl student at microscope in classroom laboratory
    High school students talking at table in debate class — Stock Photo
    High school students talking at table in debate class
    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
    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
    Junior high students in library — Stock Photo
    Junior high students in library
    Side view of a group of female Caucasian field hockey players, before a game, standing in a row, greeting the opponents, on a sunny day — Stock Photo
    Side view of a group of female Caucasian field hockey players, before a game, standing in a row, greeting the opponents, on a sunny day
    Rear view of a Caucasian female field hockey goalkeeper, during a field hockey game, standing in a goal, preparing to defend a penalty kick, with her teammates and opponents in the background, on a sunny day — Stock Photo
    Rear view of a Caucasian female field hockey goalkeeper, during a field hockey game, standing in a goal, preparing to defend a penalty kick, with her teammates and opponents in the background, on a sunny day
    High school students with hands raised in classroom — Stock Photo
    High school students with hands raised in classroom
    Junior high school students with backpacks in classroom — Stock Photo
    Junior high school students with backpacks in classroom
    Digital molecular model of secondary structure of immunoglobulin G antibodies. — Stock Photo
    Digital molecular model of secondary structure of immunoglobulin G antibodies.
    Teenage girl showing tablet computer to friend while standing in library — Stock Photo
    Teenage girl showing tablet computer to friend while standing in library
    Smiling female students studying at desk in classroom — Stock Photo
    Smiling female students studying at desk in classroom
    Side 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
    Side 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
    Schoolgirl standing near chalkboard in classroom at school — Stock Photo
    Schoolgirl standing near chalkboard in classroom at school
    Sri Lanka. Mirissa, cinnamon plantation. Drying cinnamon sticks. — Stock Photo
    Sri Lanka. Mirissa, cinnamon plantation. Drying cinnamon sticks.
    Students studying in the class at school — Stock Photo
    Students studying in the class at school
    High school boy student with backpack leaving classroom — Stock Photo
    High school boy student with backpack leaving classroom
    Junior high school student using digital tablet in classroom — Stock Photo
    Junior high school student using digital tablet in classroom
    Schoolkids using digital tablet in classroom at school — Stock Photo
    Schoolkids using digital tablet in classroom at school
    Female body with cancer metastasis, conceptual computer illustration. — Stock Photo
    Female body with cancer metastasis, conceptual computer illustration.
    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