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    Boy examining a molecular structure — Stock Photo
    Boy examining a molecular structure
    Thoughtful stylish male in suit sitting table in posh room and looking away — Stock Photo
    Thoughtful stylish male in suit sitting table in posh room and looking away
    Side view close up of a young African schoolboy sitting at his desk and turning around, looking to camera and smiling during a lesson in a township elementary school classroom. — Stock Photo
    Side view close up of a young African schoolboy sitting at his desk and turning around, looking to camera and smiling during a lesson in a township elementary school classroom.
    Students on a science lesson — Stock Photo
    Students on a science lesson
    Lettuce leaves on white — Stock Photo
    Lettuce leaves on white
    Male teacher leading physics lesson at whiteboard in classroom — Stock Photo
    Male teacher leading physics lesson at whiteboard in classroom
    Woman awarding a rosette badge to a student — Stock Photo
    Woman awarding a rosette badge to a student
    Successful adult business people sitting in meeting — Stock Photo
    Successful adult business people sitting in meeting
    African american student raising hand in class — Stock Photo
    African american student raising hand in class
    Serious pensive adult male theater artist with makeup and in elegant outfit looking away while thinking over decision — Stock Photo
    Serious pensive adult male theater artist with makeup and in elegant outfit looking away while thinking over decision
    College students raising hands in science laboratory classroom — Stock Photo
    College students raising hands in science laboratory classroom
    Businesswoman leading conference presentation, answering audience questions — Stock Photo
    Businesswoman leading conference presentation, answering audience questions
    Girl holding a model of a helix structure — Stock Photo
    Girl holding a model of a helix structure
    Front view of a teenage Caucasian boy sitting a desk looking ahead and raising his hand in a school classroom, with a row of teenage female classmates sitting at desks behind him also raising their hands — Stock Photo
    Front view of a teenage Caucasian boy sitting a desk looking ahead and raising his hand in a school classroom, with a row of teenage female classmates sitting at desks behind him also raising their hands
    Serious pensive adult male theater artist with makeup and in elegant outfit looking at camera while thinking over decision — Stock Photo
    Serious pensive adult male theater artist with makeup and in elegant outfit looking at camera while thinking over decision
    Girl in a science class — Stock Photo
    Girl in a science class
    College student raising hand in computer lab classroom — Stock Photo
    College student raising hand in computer lab classroom
    A child working at home, looking at the teacher on the screen online lessons raising his hand to answer questions — Stock Photo
    A child working at home, looking at the teacher on the screen online lessons raising his hand to answer questions
    Question mark key on computer keyboard, close-up — Stock Photo
    Question mark key on computer keyboard, close-up
    From below of classy adult male theater artist in burgundy jacket and with makeup pointing at camera and looking with question and arrogance — Stock Photo
    From below of classy adult male theater artist in burgundy jacket and with makeup pointing at camera and looking with question and arrogance
    Mid section of senior woman playing jigsaw puzzle at home — Stock Photo
    Mid section of senior woman playing jigsaw puzzle at home
    Businessmen talking in office while sitting at table — Stock Photo
    Businessmen talking in office while sitting at table
    Three people at a table with digital tablet — Stock Photo
    Three people at a table with digital tablet
    Focused senior male mechanic in workwear reading professional book while searching for solution of technical problem near bookcase — Stock Photo
    Focused senior male mechanic in workwear reading professional book while searching for solution of technical problem near bookcase
    Students on a science lesson — Stock Photo
    Students on a science lesson
    Thoughtful doubtful beautiful curly haired female in trendy head wrap looking at camera against yellow background — Stock Photo
    Thoughtful doubtful beautiful curly haired female in trendy head wrap looking at camera against yellow background
    Thoughtful doubtful beautiful curly haired female in trendy eyeglasses and stylish colorful blouse with floral ornament looking at camera against pink background — Stock Photo
    Thoughtful doubtful beautiful curly haired female in trendy eyeglasses and stylish colorful blouse with floral ornament looking at camera against pink background
    Serious pensive adult male theater artist with makeup and in elegant outfit looking at camera while thinking over decision — Stock Photo
    Serious pensive adult male theater artist with makeup and in elegant outfit looking at camera while thinking over decision
    Portrait of a red-haired little girl indoors holding her finger in front of the mouth with an inquiring look on her face — Stock Photo
    Portrait of a red-haired little girl indoors holding her finger in front of the mouth with an inquiring look on her face
    Front view of a middle aged African school teacher standing in front of the blackboard showing her pupils a laptop during a lesson in a township elementary school classroom. — Stock Photo
    Front view of a middle aged African school teacher standing in front of the blackboard showing her pupils a laptop during a lesson in a township elementary school classroom.
    Caucasian businessman standing beside a screen giving presentation to male and female colleagues in meeting room, one raising her hand. Creative business professionals working in a busy modern office. — Stock Photo
    Caucasian businessman standing beside a screen giving presentation to male and female colleagues in meeting room, one raising her hand. Creative business professionals working in a busy modern office.
    Teacher calling on student with hand raised in adult education classroom — Stock Photo
    Teacher calling on student with hand raised in adult education classroom
    Student writing formula and equations — Stock Photo
    Student writing formula and equations
    Woman with microphone asking question in audience at conference — Stock Photo
    Woman with microphone asking question in audience at conference
    Elegant adult male performer in classy suit and with makeup appealing and making question gesture while sitting at table and looking at camera — Stock Photo
    Elegant adult male performer in classy suit and with makeup appealing and making question gesture while sitting at table and looking at camera
    Eager audience asking questions — Stock Photo
    Eager audience asking questions
    Front view of a teenage Caucasian boy in a high school classroom sitting at desk, raising his hand to answer a question, with teenage male classmates sitting at desks working in the background — Stock Photo
    Front view of a teenage Caucasian boy in a high school classroom sitting at desk, raising his hand to answer a question, with teenage male classmates sitting at desks working in the background
    Front view of a mixed race teenage girl sitting at a desk in a classroom and raising their hands, her classmates also raising their hands in the background — Stock Photo
    Front view of a mixed race teenage girl sitting at a desk in a classroom and raising their hands, her classmates also raising their hands in the background
    Businesswoman asking question in conference audience — Stock Photo
    Businesswoman asking question in conference audience
    Front view of a teenage mixed-race boy in a school classroom sitting at desk, raising his hand to answer a question, 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, raising his hand to answer a question, with teenage male and female classmates sitting at desks working in the background
    Group making scientific models — Stock Photo
    Group making scientific models
    Thoughtful stylish male in suit sitting table in posh room and looking away — Stock Photo
    Thoughtful stylish male in suit sitting table in posh room and looking away
    Businesswoman leading conference presentation, answering audience questions — Stock Photo
    Businesswoman leading conference presentation, answering audience questions
    Side view close up of multi-ethnic group of smiling high school teenagers in a school classroom sitting at desks, all raising their hands to answer a question — Stock Photo
    Side view close up of multi-ethnic group of smiling high school teenagers in a school classroom sitting at desks, all raising their hands to answer a question
    Front view of a young African schoolboy sitting at his desk, raising his hand to answer a question during a lesson in a township elementary school classroom, in the foreground a schoolgirl is listening attentively — Stock Photo
    Front view of a young African schoolboy sitting at his desk, raising his hand to answer a question during a lesson in a township elementary school classroom, in the foreground a schoolgirl is listening attentively
    Doctor questioning patient and writing on clipboard — Stock Photo
    Doctor questioning patient and writing on clipboard
    Front view of multi-ethnic group of teenagers in a high school classroom sitting at desks, all raising their hands to answer a question — Stock Photo
    Front view of multi-ethnic group of teenagers in a high school classroom sitting at desks, all raising their hands to answer a question
    Thoughtful doubtful beautiful curly haired female in trendy eyeglasses and stylish colorful blouse with floral ornament looking at camera against pink background — Stock Photo
    Thoughtful doubtful beautiful curly haired female in trendy eyeglasses and stylish colorful blouse with floral ornament looking at camera against pink background
    Children Green Science Fair event. — Stock Photo
    Children Green Science Fair event.
    Winning a trophy at the Green Science Fair. — Stock Photo
    Winning a trophy at the Green Science Fair.
    Close up of wooden cube with question mark — Stock Photo
    Close up of wooden cube with question mark
    Female speaker with microphone answering audience questions — Stock Photo
    Female speaker with microphone answering audience questions
    Front view of a multi-ethnic group of teenage school pupils sitting at desks in a classroom and raising their hands — Stock Photo
    Front view of a multi-ethnic group of teenage school pupils sitting at desks in a classroom and raising their hands
    Successful adult business people talking in meeting — Stock Photo
    Successful adult business people talking in meeting
    Man using a digital tablet — Stock Photo
    Man using a digital tablet
    Portrait of young black woman pensive in front of a yellow wall — Stock Photo
    Portrait of young black woman pensive in front of a yellow wall
    Front view of a multi-ethnic group of boy soccer players sitting on a playing field on a sunny day listening to their mixed race male coach during a soccer training session — Stock Photo
    Front view of a multi-ethnic group of boy soccer players sitting on a playing field on a sunny day listening to their mixed race male coach during a soccer training session
    Girl in a science class — Stock Photo
    Girl in a science class
    Young ethnic man making grimace doubting face with finger looking at camera wearing trendy denim jacket with floral pattern while standing against gray background — Stock Photo
    Young ethnic man making grimace doubting face with finger looking at camera wearing trendy denim jacket with floral pattern while standing against gray background
    Handing over house key with question mark — Stock Photo
    Handing over house key with question mark