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    Male instructor leading lesson at projection screen in classroom — Stock Photo
    Male instructor leading lesson at projection screen in classroom
    Preschooler boy coloring shapes with colorful pens for developmental psychology test in psychologist office. — Stock Photo
    Preschooler boy coloring shapes with colorful pens for developmental psychology test in psychologist office.
    Anatomy of human skeleton hand bones, computer illustration. — Stock Photo
    Anatomy of human skeleton hand bones, computer illustration.
    Transparent male silhouette with colored stomach, computer illustration. — Stock Photo
    Transparent male silhouette with colored stomach, computer illustration.
    College students with coffee descending stairway — Stock Photo
    College students with coffee descending stairway
    Shoulder bones in x-ray digital illustration of human body. — Stock Photo
    Shoulder bones in x-ray digital illustration of human body.
    Chinese schoolchildren reading books at school yard — Stock Photo
    Chinese schoolchildren reading books at school yard
    Composition of fresh green plants in glass vase and stacked books with yellow textile on wooden desk against white background — Stock Photo
    Composition of fresh green plants in glass vase and stacked books with yellow textile on wooden desk against white background
    Smiling female students studying at desk in classroom — Stock Photo
    Smiling female students studying at desk in classroom
    Young female friends discussing notes — Stock Photo
    Young female friends discussing notes
    African american student raising hand in class — Stock Photo
    African american student raising hand in class
    Multiethnic male and female friends — Stock Photo
    Multiethnic male and female friends
    Thoughtful schoolboy in casual wear and wireless headphones enjoying music and drawing with pencils while spending free time in bedroom — Stock Photo
    Thoughtful schoolboy in casual wear and wireless headphones enjoying music and drawing with pencils while spending free time in bedroom
    Close-up of a small child sitting in a patch of light doing homework — Stock Photo
    Close-up of a small child sitting in a patch of light doing homework
    Business people talking, meeting at computer — Stock Photo
    Business people talking, meeting at computer
    Daughter climbing on mother whilst she plays guitar at home — Stock Photo
    Daughter climbing on mother whilst she plays guitar at home
    Women pointing out to a screen of laptop at home — Stock Photo
    Women pointing out to a screen of laptop at home
    Girl doing homework in back seat of car — Stock Photo
    Girl doing homework in back seat of car
    Abstract male silhouette with visible lumbar spine, computer illustration. — Stock Photo
    Abstract male silhouette with visible lumbar spine, computer illustration.
    Young woman with Down Syndrome measuring muffin mix — Stock Photo
    Young woman with Down Syndrome measuring muffin mix
    Close-up of girl writing on blackboard in classroom — Stock Photo
    Close-up of girl writing on blackboard in classroom
    Illustration of skull in human skeleton on white background. — Stock Photo
    Illustration of skull in human skeleton on white background.
    Portrait confident teenage boy student in shop class — Stock Photo
    Portrait confident teenage boy student in shop class
    Portrait of Caucasian female conservation volunteer cleaning up forest in the countryside, holding rubbish bag. Ecology and social responsibility in rural environment. — Stock Photo
    Portrait of Caucasian female conservation volunteer cleaning up forest in the countryside, holding rubbish bag. Ecology and social responsibility in rural environment.
    University students studying in library — Stock Photo
    University students studying in library
    Rear view of pupils sitting at their desks with hands raised during a lesson in a township elementary school classroom with their teacher standing writing on the blackboard in the background — Stock Photo
    Rear view of pupils sitting at their desks with hands raised during a lesson in a township elementary school classroom with their teacher standing writing on the blackboard in the background
    Male artist painting at easel in art studio — Stock Photo
    Male artist painting at easel in art studio
    Young woman reading a book in library — Stock Photo
    Young woman reading a book in library
    Portrait smiling, confident male instructor at laptop preparing in classroom — Stock Photo
    Portrait smiling, confident male instructor at laptop preparing in classroom
    Chef helping Down Syndrome students roll dough in kitchen — Stock Photo
    Chef helping Down Syndrome students roll dough in kitchen
    Portrait of Caucasian male conservation volunteer cleaning up river in the countryside, his friends picking up rubbish in the background. Ecology and social responsibility in rural environment. — Stock Photo
    Portrait of Caucasian male conservation volunteer cleaning up river in the countryside, his friends picking up rubbish in the background. Ecology and social responsibility in rural environment.
    Girl holding a rocket trophy — Stock Photo
    Girl holding a rocket trophy
    From above of crop orthodontist with pencil in hand working with white dental mold at table with professional equipment — Stock Photo
    From above of crop orthodontist with pencil in hand working with white dental mold at table with professional equipment
    Anatomy of human skeleton thorax bones, computer illustration. — Stock Photo
    Anatomy of human skeleton thorax bones, computer illustration.
    Female musculature in transparent silhouette, front view, computer illustration — Stock Photo
    Female musculature in transparent silhouette, front view, computer illustration
    Girl students researching, using computer in library — Stock Photo
    Girl students researching, using computer in library
    Illustration of kidneys in male body silhouette on white background. — Stock Photo
    Illustration of kidneys in male body silhouette on white background.
    High angle back of unrecognizable mother helping daughter with homework while sitting at table with notebook and studying at home — Stock Photo
    High angle back of unrecognizable mother helping daughter with homework while sitting at table with notebook and studying at home
    College students experimenting on microscope in laboratory at university — Stock Photo
    College students experimenting on microscope in laboratory at university
    Portrait confident young male college student studying in cafe — Stock Photo
    Portrait confident young male college student studying in cafe
    Illustration of human foot anatomy on white background. — Stock Photo
    Illustration of human foot anatomy on white background.
    Female skeleton and ligaments in transparent body, computer illustration. — Stock Photo
    Female skeleton and ligaments in transparent body, computer illustration.
    Orange colored bladder in female body silhouette, computer illustration. — Stock Photo
    Orange colored bladder in female body silhouette, computer illustration.
    Students leaving school — Stock Photo
    Students leaving school
    Caucasian female jeweller sitting at desk, wearing apron and glasses, making jewelry. independent handmade craft business. — Stock Photo
    Caucasian female jeweller sitting at desk, wearing apron and glasses, making jewelry. independent handmade craft business.
    Adult woman sitting on couch with dog using laptop while charming little girl drawing at easel at home — Stock Photo
    Adult woman sitting on couch with dog using laptop while charming little girl drawing at easel at home
    Father helping kids in drawing at table in kitchen at home. — Stock Photo
    Father helping kids in drawing at table in kitchen at home.
    Miliary tuberculosis disease in lungs, digital illustration and light micrograph. — Stock Photo
    Miliary tuberculosis disease in lungs, digital illustration and light micrograph.
    Medical illustration of twins in human womb. — Stock Photo
    Medical illustration of twins in human womb.
    Male teacher relaxing in classroom at school — Stock Photo
    Male teacher relaxing in classroom at school
    Young thoughtful female taking notes in planner on wooden bench near bicycle in park in daytime — Stock Photo
    Young thoughtful female taking notes in planner on wooden bench near bicycle in park in daytime
    Instructor training students about air conditioning units in HVAC classroom — Stock Photo
    Instructor training students about air conditioning units in HVAC classroom
    Elderly man sitting on bed with sitar and taking notes in notebook while watching online lesson on tablet — Stock Photo
    Elderly man sitting on bed with sitar and taking notes in notebook while watching online lesson on tablet
    Young child in labcoat looking into a microscope — Stock Photo
    Young child in labcoat looking into a microscope
    Happy boys playing basketball in schoolyard — Stock Photo
    Happy boys playing basketball in schoolyard
    College student using mobile phone in campus — Stock Photo
    College student using mobile phone in campus
    Realistic body model showing female anatomy on white background, computer illustration. — Stock Photo
    Realistic body model showing female anatomy on white background, computer illustration.
    Swimming instructor working with little boy in swimming pool. — Stock Photo
    Swimming instructor working with little boy in swimming pool.
    Schoolchildren sitting in classroom — Stock Photo
    Schoolchildren sitting in classroom
    Young couples college students studying using laptop and digital tablet — Stock Photo
    Young couples college students studying using laptop and digital tablet