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    Teacher explaining schoolchildren task — Stock Photo
    Teacher explaining schoolchildren task
    Male anatomy showing Internal oblique muscle, computer illustration. — Stock Photo
    Male anatomy showing Internal oblique muscle, computer illustration.
    Close up of boy looking through a microscope at a bug — Stock Photo
    Close up of boy looking through a microscope at a bug
    Elevated portrait of a young African girl looking straight to camera smiling, at a township elementary school, her classmates sitting at a desk in the background — Stock Photo
    Elevated portrait of a young African girl looking straight to camera smiling, at a township elementary school, her classmates sitting at a desk in the background
    3d illustration of cross-section of hepatitis pathogen with DNA, cell nucleus and receptors. — Stock Photo
    3d illustration of cross-section of hepatitis pathogen with DNA, cell nucleus and receptors.
    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
    Students painting in class indoors — Stock Photo
    Students painting in class indoors
    Girl sitting in a rocking chair reading a book — Stock Photo
    Girl sitting in a rocking chair reading a book
    Adult male musician in headphones playing bass guitar against netbook on sofa in living room — Stock Photo
    Adult male musician in headphones playing bass guitar against netbook on sofa in living room
    Illustration of bunion bones on white background. — Stock Photo
    Illustration of bunion bones on white background.
    Realistic human brain on white background, digital illustration. — Stock Photo
    Realistic human brain on white background, digital illustration.
    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
    Student writing on adhesive note in book — Stock Photo
    Student writing on adhesive note in book
    Side view of a teenage Caucasian boy in a school classroom sitting at desk, concentrating, looking out of the window and leaning his head on his hand — Stock Photo
    Side view of a teenage Caucasian boy in a school classroom sitting at desk, concentrating, looking out of the window and leaning his head on his hand
    Cute poy pilling potatoe at home — Stock Photo
    Cute poy pilling potatoe at home
    Side view of little talented girl drawing painting sitting at easel against window at home — Stock Photo
    Side view of little talented girl drawing painting sitting at easel against window at home
    Junior high girl students walking and talking in corridor — Stock Photo
    Junior high girl students walking and talking in corridor
    Male conductor in music recording studio — Stock Photo
    Male conductor in music recording studio
    Illustration of knee bones in human skeleton on white background. — Stock Photo
    Illustration of knee bones in human skeleton on white background.
    Female musculature in transparent silhouette, digital illustration. — Stock Photo
    Female musculature in transparent silhouette, digital illustration.
    Side view of a Caucasian teenage girl sitting on the edge of the stage holding a script in an empty school theatre during rehearsals for a performance — Stock Photo
    Side view of a Caucasian teenage girl sitting on the edge of the stage holding a script in an empty school theatre during rehearsals for a performance
    College students conducting scientific experiment in science laboratory classroom — Stock Photo
    College students conducting scientific experiment in science laboratory classroom
    Young elegant woman in eyeglasses reading book in city garden — Stock Photo
    Young elegant woman in eyeglasses reading book in city garden
    WASP-12b extrasolar planet orbiting star WASP-12, digital artwork. — Stock Photo
    WASP-12b extrasolar planet orbiting star WASP-12, digital artwork.
    Illustration of planet Kepler 1625b and proposed exomoon in Cygnus. — Stock Photo
    Illustration of planet Kepler 1625b and proposed exomoon in Cygnus.
    University Student studying notes — Stock Photo
    University Student studying notes
    High school students doing homework and talking at tables in classroom — Stock Photo
    High school students doing homework and talking at tables in classroom
    Illustration of human muscles on white background. — Stock Photo
    Illustration of human muscles on white background.
    Front view of a male Caucasian teacher standing and talking to a mixed race teenager male student sitting at his desk using a laptop in a high school classroom, with his multi-ethnic male and female classmates sitting at desks working around him — Stock Photo
    Front view of a male Caucasian teacher standing and talking to a mixed race teenager male student sitting at his desk using a laptop in a high school classroom, with his multi-ethnic male and female classmates sitting at desks working around him
    Side view of unrecognizable man sitting on staircase and writing in notebook. — Stock Photo
    Side view of unrecognizable man sitting on staircase and writing in notebook.
    Young friends using laptops — Stock Photo
    Young friends using laptops
    Abstract male silhouette with visible human skull, front view, computer illustration. — Stock Photo
    Abstract male silhouette with visible human skull, front view, computer illustration.
    Three children in school room computer laboratory with rows of computer monitors. — Stock Photo
    Three children in school room computer laboratory with rows of computer monitors.
    Teenage girl lying in bed and reading by window light. — Stock Photo
    Teenage girl lying in bed and reading by window light.
    Watercolors on the table, Crafts — Stock Photo
    Watercolors on the table, Crafts
    Small girl playing with a baby doll — Stock Photo
    Small girl playing with a baby doll
    Illustration of human bronchi on black background. — Stock Photo
    Illustration of human bronchi on black background.
    Chinese schoolgirls holding smartphone in school yard — Stock Photo
    Chinese schoolgirls holding smartphone in school yard
    Illustration of human thyroid gland and larynx on white background. — Stock Photo
    Illustration of human thyroid gland and larynx on white background.
    Schoolgirl standing near chalkboard in classroom at school — Stock Photo
    Schoolgirl standing near chalkboard in classroom at school
    Woman sitting on chair and reading book at home — Stock Photo
    Woman sitting on chair and reading book at home
    Boy reading book on coffee table — Stock Photo
    Boy reading book on coffee table
    Attentive university student doing a chemical experiment in laboratory — Stock Photo
    Attentive university student doing a chemical experiment in laboratory
    Smiling female college student texting in corridor — Stock Photo
    Smiling female college student texting in corridor
    Friends sitting by table — Stock Photo
    Friends sitting by table
    Community college journalism students at microphone in classroom — Stock Photo
    Community college journalism students at microphone in classroom
    Artists talking and painting in art class studio — Stock Photo
    Artists talking and painting in art class studio
    Students sitting on tables in class — Stock Photo
    Students sitting on tables in class
    Illustration of human lung in body silhouette. — Stock Photo
    Illustration of human lung in body silhouette.
    Portrait of smiling female student holding books in library — Stock Photo
    Portrait of smiling female student holding books in library
    Boy sitting at a table doing his homework — Stock Photo
    Boy sitting at a table doing his homework
    Young boy playing with plants whilst outside having a picnic — Stock Photo
    Young boy playing with plants whilst outside having a picnic
    Women choir with sheet music singing in music recording studio — Stock Photo
    Women choir with sheet music singing in music recording studio
    Female skeleton in transparent body silhouette, digital illustration. — Stock Photo
    Female skeleton in transparent body silhouette, digital illustration.
    Female speaker on stage talking to audience — Stock Photo
    Female speaker on stage talking to audience
    Curious little boy browsing smartphone at home — Stock Photo
    Curious little boy browsing smartphone at home
    Female skeleton on white background, computer illustration. — Stock Photo
    Female skeleton on white background, computer illustration.
    Female students discussing at desk in classroom — Stock Photo
    Female students discussing at desk in classroom
    Focused female artist with palette painting at easel in art class studio — Stock Photo
    Focused female artist with palette painting at easel in art class studio
    Cute girl doing homework — Stock Photo
    Cute girl doing homework