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    Secondary brain cancer — Stock Photo
    Secondary brain cancer
    Low angle view, looking up at a multi-ethnic team of teenage male field hockey players and their Caucasian male field hockey coach preparing before a game, in a huddle on the pitch, interacting on a sunny day — Stock Photo
    Low angle view, looking up at a multi-ethnic team of teenage male field hockey players and their Caucasian male field hockey coach preparing before a game, in a huddle on the pitch, interacting on a sunny day
    Students soldering circuit board in classroom — Stock Photo
    Students soldering circuit board in classroom
    Portrait of confident junior high student — Stock Photo
    Portrait of confident junior high student
    Side view of two teenage Caucasian male field hockey players from opposing teams in action on the pitch during a hockey game on a sunny day — Stock Photo
    Side view of two teenage Caucasian male field hockey players from opposing teams in action on the pitch during a hockey game on a sunny day
    Portrait smiling girl student using computer in computer lab — Stock Photo
    Portrait smiling girl student using computer in computer lab
    Girl student programming and assembling robotics in classroom — Stock Photo
    Girl student programming and assembling robotics in classroom
    Male teacher leading physics lesson at whiteboard in classroom — Stock Photo
    Male teacher leading physics lesson at whiteboard in classroom
    Schoolkids using mobile phone in school campus on a sunny day — Stock Photo
    Schoolkids using mobile phone in school campus on a sunny day
    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
    Girl students assembling computer in classroom — Stock Photo
    Girl students assembling computer 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 student showing tablet computer to friend while standing in lab — Stock Photo
    Male student showing tablet computer to friend while standing in lab
    Surprised students conducting exploding foam scientific experiment in classroom laboratory — Stock Photo
    Surprised students conducting exploding foam scientific experiment in classroom laboratory
    Junior high school students using futuristic touch screen in classroom — Stock Photo
    Junior high school students using futuristic touch screen in classroom
    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
    Female college student using digital tablet at desk in classroom — Stock Photo
    Female college student using digital tablet at desk in classroom
    Portrait of a teenage mixed race male field hockey player, wearing a red team strip, standing in a changing room looking straight to camera, focusing before a game — Stock Photo
    Portrait of a teenage mixed race male field hockey player, wearing a red team strip, standing in a changing room looking straight to camera, focusing before a game
    Smiling teenage girl showing tablet computer to friend while standing in library — Stock Photo
    Smiling teenage girl showing tablet computer to friend while standing in library
    Front view of a teenage Caucasian girl in a school classroom sitting at desk, with her head leaning on her hand, looking away, 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, with her head leaning on her hand, looking away, with teenage male and female classmates sitting at desks working in the background
    Front view close up of a Caucasian teenage boy sitting at a desk in a school classroom writing in a notebook, with a classmate sitting at a desk in the background — Stock Photo
    Front view close up of a Caucasian teenage boy sitting at a desk in a school classroom writing in a notebook, with a classmate sitting at a desk in the background
    Focused junior high boy student using computer in computer lab — Stock Photo
    Focused junior high boy student using computer in computer lab
    Teenagers playing pool in community center — Stock Photo
    Teenagers playing pool in community center
    Front view of a Caucasian male high school teacher, standing and talking with a teenage Caucasian girl in a school classroom sitting at desk, with teenage classmates sitting at desks working in the background — Stock Photo
    Front view of a Caucasian male high school teacher, standing and talking with a teenage Caucasian girl in a school classroom sitting at desk, with teenage classmates sitting at desks working in the background
    Male student practicing experiment in lab — Stock Photo
    Male student practicing experiment in lab
    Teenage female practicing chemistry experiment in lab — Stock Photo
    Teenage female practicing chemistry experiment in lab
    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
    Smiling, eager girl student asking a question in classroom — Stock Photo
    Smiling, eager girl student asking a question in classroom
    Portrait of smiling, confident junior high school girl in classroom — Stock Photo
    Portrait of smiling, confident junior high school girl in classroom
    Focused junior high school student using digital tablet in classroom — Stock Photo
    Focused junior high school student using digital tablet in classroom
    Boy students conducting scientific experiment, examining liquid in test tube in laboratory classroom — Stock Photo
    Boy students conducting scientific experiment, examining liquid in test tube in laboratory classroom
    Front view of a multi-ethnic group of teenage school pupils standing together in a classroom and smiling to camera at break time — Stock Photo
    Front view of a multi-ethnic group of teenage school pupils standing together in a classroom and smiling to camera at break time
    Side view of a Caucasian female field hockey player preparing before a game, sitting in a changing room, holding a hockey helmet — Stock Photo
    Side view of a Caucasian female field hockey player preparing before a game, sitting in a changing room, holding a hockey helmet
    Male high school teacher leading lesson at projection screen in classroom — Stock Photo
    Male high school teacher leading lesson at projection screen in classroom
    Boy student examining DNA model in laboratory classroom — Stock Photo
    Boy student examining DNA model in laboratory classroom
    Pensive, curious girl student examining molecular structure — Stock Photo
    Pensive, curious girl student examining molecular structure
    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
    Students studying at desk in classroom — Stock Photo
    Students studying at desk in classroom
    Side view of a group of female Caucasian field hockey players, training before a game, working out on a field hockey pitch, doing exercises, stretching their legs, holding their feet behind their back 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 exercises, stretching their legs, holding their feet behind their back on a sunny day
    Portrait confident african american boy playing basketball in schoolyard — Stock Photo
    Portrait confident african american boy playing basketball in schoolyard
    Focused boy students using digital tablet and microscope, conducting scientific experiment in laboratory classroom — Stock Photo
    Focused boy students using digital tablet and microscope, conducting scientific experiment in laboratory classroom
    High angle rear 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 — Stock Photo
    High angle rear 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
    France, Paris. Vincennes. Bois de Vincennes. La Ferme de Paris. Organic agriculture and farming educational farm. — Stock Photo
    France, Paris. Vincennes. Bois de Vincennes. La Ferme de Paris. Organic agriculture and farming educational farm.
    Side view mid section of musician teenage girl sitting by a window in a shadow and playing a ukulele — Stock Photo
    Side view mid section of musician teenage girl sitting by a window in a shadow and playing a ukulele
    Portrait close up of a Caucasian teenage boy with dark hair and grey eyes sitting at a desk in a school classroom wearing headphones and looking at of a window — Stock Photo
    Portrait close up of a Caucasian teenage boy with dark hair and grey eyes sitting at a desk in a school classroom wearing headphones and looking at of a window
    Front view of a high school teenage Caucasian boy and teenage mixed race boy in a school classroom sitting a desk, working together, writing and reading in their books, with teenage male and female classmates — Stock Photo
    Front view of a high school teenage Caucasian boy and teenage mixed race boy in a school classroom sitting a desk, working together, writing and reading in their books, with teenage male and female classmates
    Over the shoulder view of a Caucasian male field hockey coach interacting with a group of female Caucasian field hockey players, sitting in a changing room, holding a digital tablet — Stock Photo
    Over the shoulder view of a Caucasian male field hockey coach interacting with a group of female Caucasian field hockey players, sitting in a changing room, holding a digital tablet
    Male student reading record while practicing chemistry experiment in lab — Stock Photo
    Male student reading record while practicing chemistry experiment in lab
    Junior high students hanging out, talking — Stock Photo
    Junior high students hanging out, talking
    Front view of a multi-ethnic group of teenage pupils sitting at desks in class studying at school with a Caucasian male teacher standing and talking to one Caucasian boy at his desk — Stock Photo
    Front view of a multi-ethnic group of teenage pupils sitting at desks in class studying at school with a Caucasian male teacher standing and talking to one Caucasian boy at his desk
    Front view of a multi-ethnic group of teenage male and female musicians sitting in a classroom playing their instruments during a school band practice — Stock Photo
    Front view of a multi-ethnic group of teenage male and female musicians sitting in a classroom playing their instruments during a school band practice
    Male teacher helping junior high school students at desk in classroom — Stock Photo
    Male teacher helping junior high school students at desk in classroom
    Thoughtful schoolkid sitting in the classroom at school — Stock Photo
    Thoughtful schoolkid sitting in the classroom at school
    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
    Side view mid section of a mixed race teenage schoolgirl sitting at a desk in class using a laptop computer — Stock Photo
    Side view mid section of a mixed race teenage schoolgirl sitting at a desk in class using a laptop computer
    Side view of college students studying at desk in classroom — Stock Photo
    Side view of college students studying at desk in classroom
    Front view of a Caucasian female and male high school pupils hanging out and embracing each other, standing in their school grounds — Stock Photo
    Front view of a Caucasian female and male high school pupils hanging out and embracing each other, standing in their school grounds
    Front view of a teenage mixed-race boy in a school classroom sitting at desk, concentrating and using laptop computer, with teenage male and female classmates sitting at desks working in the background — Stock Photo
    Front view of a teenage mixed-race boy in a school classroom sitting at desk, concentrating and using laptop computer, with teenage male and female classmates sitting at desks working in the background
    Schoolkids studying in the classroom at school — Stock Photo
    Schoolkids studying in the classroom at school
    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.