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961 results

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    Chinese businessman talking on phone outdoors — Stock Photo
    Chinese businessman talking on phone outdoors
    Smiling university students raising hands at seminar — Stock Photo
    Smiling university students raising hands at seminar
    Angled view of vintage checker board — Stock Photo
    Angled view of vintage checker board
    Winning a trophy at the Green Science Fair. — Stock Photo
    Winning a trophy at the Green Science Fair.
    Schoolgirl explaining about world map in classroom at school — Stock Photo
    Schoolgirl explaining about world map in classroom at school
    Silhouette of human brain on plain background, digital illustration. — Stock Photo
    Silhouette of human brain on plain background, digital illustration.
    Human brain, computer illustration — Stock Photo
    Human brain, computer illustration
    Happy schoolgirls sitting at desk — Stock Photo
    Happy schoolgirls sitting at desk
    View of students sitting at desks during test in classroom — Stock Photo
    View of students sitting at desks during test in classroom
    Mature teacher explaining student — Stock Photo
    Mature teacher explaining student
    Hand of teacher writing spelling — Stock Photo
    Hand of teacher writing spelling
    Happy junior high schoolgirl — Stock Photo
    Happy junior high schoolgirl
    Cheerful stylish man headphones with backpack raising hand celebrating victory and jumping clasping foot on background — Stock Photo
    Cheerful stylish man headphones with backpack raising hand celebrating victory and jumping clasping foot on background
    Conceptual artwork of human brain illustrating square-thinking process. — Stock Photo
    Conceptual artwork of human brain illustrating square-thinking process.
    Top view of cute blonde little girl playing at playground — Stock Photo
    Top view of cute blonde little girl playing at playground
    Student standing with apple in hands — Stock Photo
    Student standing with apple in hands
    Girl lifts her hair from her forehead to have her temperature measured — Stock Photo
    Girl lifts her hair from her forehead to have her temperature measured
    Facial recognition, computer illustration — Stock Photo
    Facial recognition, computer illustration
    Young woman standing by locker — Stock Photo
    Young woman standing by locker
    Teacher assisting student — Stock Photo
    Teacher assisting student
    Children looking at teacher — Stock Photo
    Children looking at teacher
    Mature female professor teaching students — Stock Photo
    Mature female professor teaching students
    Hispanic girl painting at home. — Stock Photo
    Hispanic girl painting at home.
    Boy in a suit and dark glasses standing on the edge of water counting dollar bills. — Stock Photo
    Boy in a suit and dark glasses standing on the edge of water counting dollar bills.
    Mid adult man leaning over table, using laptop and looking in camera in office. — Stock Photo
    Mid adult man leaning over table, using laptop and looking in camera in office.
    Teenage girl performing experiment in chemistry lab — Stock Photo
    Teenage girl performing experiment in chemistry lab
    Male teacher teaching students in the class at school — Stock Photo
    Male teacher teaching students in the class at school
    Side view of happy African-American family sitting together and reading storybook at home — Stock Photo
    Side view of happy African-American family sitting together and reading storybook at home
    Students interacting with teacher — Stock Photo
    Students interacting with teacher
    Happy junior high schoolboy — Stock Photo
    Happy junior high schoolboy
    Child walking on floor — Stock Photo
    Child walking on floor
    Little girl with snail on face — Stock Photo
    Little girl with snail on face
    Female students analyzing results of experiments — Stock Photo
    Female students analyzing results of experiments
    Grandmother & Child on Tablet — Stock Photo
    Grandmother & Child on Tablet
    Portrait of confident schoolgirl — Stock Photo
    Portrait of confident schoolgirl
    Thoughtful schoolgirl smiling — Stock Photo
    Thoughtful schoolgirl smiling
    Teacher explaining material — Stock Photo
    Teacher explaining material
    Close up of Game and chess pieces on dark background — Stock Photo
    Close up of Game and chess pieces on dark background
    Man walking up stairs — Stock Photo
    Man walking up stairs
    Schoolboy using mobile phone near chalkboard in classroom — Stock Photo
    Schoolboy using mobile phone near chalkboard in classroom
    Unrecognizable woman reading book on bed at home — Stock Photo
    Unrecognizable woman reading book on bed at home
    Portrait of young Chinese businessman looking away in city — Stock Photo
    Portrait of young Chinese businessman looking away in city
    Mature woman posing in sunlight — Stock Photo
    Mature woman posing in sunlight
    Schoolgirl writing in workbook at class — Stock Photo
    Schoolgirl writing in workbook at class
    Girl drawing bar graph — Stock Photo
    Girl drawing bar graph
    Thoughtful schoolboy looking away — Stock Photo
    Thoughtful schoolboy looking away
    Cute boy looking away — Stock Photo
    Cute boy looking away
    Serious schoolboy sitting at desk — Stock Photo
    Serious schoolboy sitting at desk
    Happy boy leaning at desk — Stock Photo
    Happy boy leaning at desk
    Teacher assisting schoolboy at desk — Stock Photo
    Teacher assisting schoolboy at desk
    Girl rising hand up and answer to teacher — Stock Photo
    Girl rising hand up and answer to teacher
    Brain hot-air balloon in sky — Stock Photo
    Brain hot-air balloon in sky
    Young businessman in suit with hands clasped having meeting with couple. — Stock Photo
    Young businessman in suit with hands clasped having meeting with couple.
    Man checking time — Stock Photo
    Man checking time
    Teenage girl holding pipette while practicing chemistry experiment at desk in lab — Stock Photo
    Teenage girl holding pipette while practicing chemistry experiment at desk in lab
    Boy decorating Christmas cookies — Stock Photo
    Boy decorating Christmas cookies
    Large radio antenna — Stock Photo
    Large radio antenna
    Seedling growing out of brain — Stock Photo
    Seedling growing out of brain
    Junior high students studying — Stock Photo
    Junior high students studying
    Schoolboy writing on chalkboard in classroom at school — Stock Photo
    Schoolboy writing on chalkboard in classroom at school