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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.
    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
    Side view of a Caucasian female field hockey player, during a field hockey game, executing a penalty kick, with a goal protected by a goalkeeper in the background, on a sunny day — Stock Photo
    Side view of a Caucasian female field hockey player, during a field hockey game, executing a penalty kick, with a goal protected by a goalkeeper in the background, on a sunny day
    Teenage girls designing denim jacket in fashion design class — Stock Photo
    Teenage girls designing denim jacket in fashion design class
    Schoolkid using digital tablet in classroom at school — Stock Photo
    Schoolkid using digital tablet in classroom at school
    Portrait smiling, confident junior high school girl studying in classroom — Stock Photo
    Portrait smiling, confident junior high school girl studying in classroom
    Portrait close up of a Caucasian teenage boy with short dark hair and grey eyes standing in a school classroom smiling to camera, with classmates talking in the background — Stock Photo
    Portrait close up of a Caucasian teenage boy with short dark hair and grey eyes standing in a school classroom smiling to camera, with classmates talking in the background
    Portrait smiling, confident tween boy playing basketball in schoolyard — Stock Photo
    Portrait smiling, confident tween boy playing basketball in schoolyard
    Boy playing table tennis — Stock Photo
    Boy playing table tennis
    Junior high students using computers in computer lab — Stock Photo
    Junior high students using computers in computer lab
    High school students with hands raised, asking questions during lesson in classroom — Stock Photo
    High school students with hands raised, asking questions during lesson in classroom
    Central Asia, Kyrgyzstan, Issyk Kul Province (Ysyk-K?l), Juuku valley, the shepherd Gengibek Makanbietov leads his 24 horses in the mountains pasture — Stock Photo
    Central Asia, Kyrgyzstan, Issyk Kul Province (Ysyk-K?l), Juuku valley, the shepherd Gengibek Makanbietov leads his 24 horses in the mountains pasture
    Side view of a Caucasian female field hockey player preparing before a game, sitting in a changing room, wearing a hockey helmet — Stock Photo
    Side view of a Caucasian female field hockey player preparing before a game, sitting in a changing room, wearing a hockey helmet
    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
    Side view mid section of a Caucasian female field hockey player, training before a game, working out on a hockey pitch, exercising, with two her teammates and a coach, on a sunny day — Stock Photo
    Side view mid section of a Caucasian female field hockey player, training before a game, working out on a hockey pitch, exercising, with two her teammates and a coach, on a sunny day
    Rear view of a group of female Caucasian field hockey players, preparing before a game, standing in a row embracing with hands on their teammates shoulders, 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 with hands on their teammates shoulders, on a sunny day
    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
    Junior high students using digital tablet — Stock Photo
    Junior high students using digital tablet
    Female college students studying at desk in classroom — Stock Photo
    Female college students studying at desk in classroom
    Girl student using microscope, conducting scientific experiment in laboratory classroom — Stock Photo
    Girl student using microscope, conducting scientific experiment in laboratory classroom
    Junior high school boy student doing homework in classroom — Stock Photo
    Junior high school boy student doing homework in classroom
    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
    Focused boy student programming at computer in dark classroom — Stock Photo
    Focused boy student programming at computer in dark classroom
    High angle view of female student studying at desk in classroom — Stock Photo
    High angle view of female student studying at desk in classroom
    Junior high boy students and male teacher taking selfie with smart phone — Stock Photo
    Junior high boy students and male teacher taking selfie with smart phone
    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
    Front view of two Caucasian teenage boys sitting in front of a window playing a trombone and a French horn — Stock Photo
    Front view of two Caucasian teenage boys sitting in front of a window playing a trombone and a French horn
    High school students watching teacher leading lesson at whiteboard in classroom — Stock Photo
    High school students watching teacher leading lesson at whiteboard in classroom
    Side view of a group of happy female Caucasian field hockey players, preparing before a game, standing in a row embracing with hands on their teammates shoulders, smiling on a sunny day — Stock Photo
    Side view of a group of happy female Caucasian field hockey players, preparing before a game, standing in a row embracing with hands on their teammates shoulders, smiling on a sunny day
    Side view of a group of female Caucasian field hockey players and their Caucasian field hockey coach, training before a game, working out on a field hockey pitch, exercising, doing sit ups, on a sunny day — Stock Photo
    Side view of a group of female Caucasian field hockey players and their Caucasian field hockey coach, training before a game, working out on a field hockey pitch, exercising, doing sit ups, on a sunny day
    Side view of a teenage Caucasian boy in a school classroom sitting at desk, concentrating and smiling, with teenage male and female classmates sitting at desks working in the background — Stock Photo
    Side view of a teenage Caucasian boy in a school classroom sitting at desk, concentrating and smiling, with teenage male and female classmates sitting at desks working in the background
    Junior high school girl student with hand raised in classroom — Stock Photo
    Junior high school girl student with hand raised in classroom
    Female college student using microscope while practicing experiment in lab — Stock Photo
    Female college student using microscope while practicing experiment in lab
    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
    Teenage boys in high school art class — Stock Photo
    Teenage boys in high school art class
    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
    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
    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
    Female university student studying at desk in classroom — Stock Photo
    Female university student studying at desk in classroom
    Junior high school students using futuristic touch screen in classroom — Stock Photo
    Junior high school students using futuristic touch screen in classroom
    Side view close up 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 close up 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
    Front view of a group of female Caucasian field hockey players training before a game, standing on a hockey pitch, resting, one player squatting, on a sunny day — Stock Photo
    Front view of a group of female Caucasian field hockey players training before a game, standing on a hockey pitch, resting, one player squatting, on a sunny day
    Students watching geography teacher at projection screen in dark classroom — Stock Photo
    Students watching geography teacher at projection screen in dark classroom
    Teachers talking at library — Stock Photo
    Teachers talking at library
    Teenagers playing pool in community center — Stock Photo
    Teenagers playing pool in community center
    Boy student using microscope, conducting scientific experiment in laboratory classroom — Stock Photo
    Boy student using microscope, conducting scientific experiment in laboratory classroom
    Male teacher and students conducting scientific experiment in laboratory classroom — Stock Photo
    Male teacher and students conducting scientific experiment in laboratory classroom
    Male teacher helping girl student using microscope, conducting scientific experiment in laboratory classroom — Stock Photo
    Male teacher helping girl student using microscope, conducting scientific experiment in laboratory classroom
    Male teacher leading lesson at projection screen in classroom — Stock Photo
    Male teacher leading lesson at projection screen in classroom
    Teenage female practicing chemistry experiment in lab — Stock Photo
    Teenage female practicing chemistry experiment in lab
    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
    Human ovary structure — Stock Photo
    Human ovary structure
    Side view of a multi-ethnic group of teenage male field hokey players, training with their coach before a game, working out on a field hockey pitch on a sunny day, running on the spot — Stock Photo
    Side view of a multi-ethnic group of teenage male field hokey players, training with their coach before a game, working out on a field hockey pitch on a sunny day, running on the spot
    Female teacher helping students working at computers in computer lab classroom — Stock Photo
    Female teacher helping students working at computers in computer lab classroom
    Rear view of a Caucasian woman conductor directing 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
    Rear view of a Caucasian woman conductor directing 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
    Young university students practicing chemistry experiment in lab — Stock Photo
    Young university students practicing chemistry experiment in lab
    Schoolboy looking at globe in classroom at school — Stock Photo
    Schoolboy looking at globe in classroom at school
    Students working at computers in laboratory — Stock Photo
    Students working at computers in laboratory
    College students sitting at table during exam in classroom — Stock Photo
    College students sitting at table during exam in classroom