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    Side view of multi-ethnic group of high school teenagers in a school classroom sitting at desks, all raising their hands to answer a question — Stock Photo
    Side view of multi-ethnic group of high school teenagers in a school classroom sitting at desks, all raising their hands to answer a question
    Group of children in a classroom — Stock Photo
    Group of children in a classroom
    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
    Front view of two young African schoolgirls sitting at their desk, one raising her hand to answer a question and the other writing in her notebook during a lesson — Stock Photo
    Front view of two young African schoolgirls sitting at their desk, one raising her hand to answer a question and the other writing in her notebook during a lesson
    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
    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
    Group making scientific models — Stock Photo
    Group making scientific models
    Children at a Green Science Fair event — Stock Photo
    Children at a Green Science Fair event
    Winning a trophy at the Green Science Fair. — Stock Photo
    Winning a trophy at the Green Science Fair.
    Speaker on stage answering audience questions — Stock Photo
    Speaker on stage answering audience questions
    Thoughtful doubtful beautiful curly haired female in trendy eyeglasses and stylish colorful blouse with floral ornament looking away against pink background — Stock Photo
    Thoughtful doubtful beautiful curly haired female in trendy eyeglasses and stylish colorful blouse with floral ornament looking away against pink background
    Serious pensive adult male theater artist with makeup and in elegant outfit touching chin and looking at camera while thinking over decision — Stock Photo
    Serious pensive adult male theater artist with makeup and in elegant outfit touching chin and 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
    Student writing formula — Stock Photo
    Student writing formula
    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
    Student writing formula and equations — Stock Photo
    Student writing formula and equations
    Boy holding a molecular structure model — Stock Photo
    Boy holding a molecular structure model
    Doubting stylish male in suit sitting table in posh room and looking away — Stock Photo
    Doubting stylish male in suit sitting table in posh room and looking away
    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
    Portrait of 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
    Portrait of young ethnic man making grimace doubting face with finger looking at camera wearing trendy denim jacket with floral pattern while standing against gray background
    College student raising hand in computer lab classroom — Stock Photo
    College student raising hand in computer lab classroom
    Raw T-bone steak — Stock Photo
    Raw T-bone steak
    Man talking at press conference — Stock Photo
    Man talking at press conference
    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
    High school students with arms raised, asking questions in classroom — Stock Photo
    High school students with arms raised, asking questions in classroom
    Thoughtful doubtful beautiful curly haired female in trendy eyeglasses and stylish colorful blouse with floral ornament looking away against pink background — Stock Photo
    Thoughtful doubtful beautiful curly haired female in trendy eyeglasses and stylish colorful blouse with floral ornament looking away against pink background
    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
    Female speaker with microphone answering audience questions — Stock Photo
    Female speaker with microphone answering audience questions
    Thoughtful sad stylish male in suit sitting table in posh room and looking away — Stock Photo
    Thoughtful sad stylish male in suit sitting table in posh room and looking away
    Group of students on science lesson — Stock Photo
    Group of students on science lesson
    Front view close up of a group of young African schoolchildren sitting at their desks, raising hands to answer a question during a lesson in a township elementary school classroom — Stock Photo
    Front view close up of a group of young African schoolchildren sitting at their desks, raising hands to answer a question during a lesson in a township elementary school classroom
    Senior couple using a digital tablet — Stock Photo
    Senior couple using a digital tablet
    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
    Businessman talking in meeting — Stock Photo
    Businessman talking in meeting
    Successful adult business people talking in meeting — Stock Photo
    Successful adult business people talking in meeting
    Teacher and students with hands raised in adult education class — Stock Photo
    Teacher and students with hands raised in adult education class
    Young trendy guy in stylish denim jacket begging with folded hands near chin and looking at camera against gray background — Stock Photo
    Young trendy guy in stylish denim jacket begging with folded hands near chin and looking at camera against gray background
    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
    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
    College students raising hands in science laboratory classroom — Stock Photo
    College students raising hands in science laboratory 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.
    Girl in a science class — Stock Photo
    Girl in a science class
    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
    A group of Caucasian boys and girls at a boot camp on a sunny day, sitting on the grass, smiling and raising their hands, volunteering to an unseen fitness coach — Stock Photo
    A group of Caucasian boys and girls at a boot camp on a sunny day, sitting on the grass, smiling and raising their hands, volunteering to an unseen fitness coach
    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, around him classmates are sitting at their desks and 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, around him classmates are sitting at their desks and listening attentively
    Group of children in a classroom — Stock Photo
    Group of children in a classroom
    Girl holding a model of a helix structure — Stock Photo
    Girl holding a model of a helix structure
    Girl in a science class — Stock Photo
    Girl in a science class
    Female speaker on stage answering audience questions — Stock Photo
    Female speaker on stage answering audience questions
    Close up of wooden cube with question mark — Stock Photo
    Close up of wooden cube with question mark
    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
    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
    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
    Businesswoman leading conference presentation, answering audience questions — Stock Photo
    Businesswoman leading conference presentation, answering audience questions
    Close-up of wooden dice on a wooden table — Stock Photo
    Close-up of wooden dice on a wooden table
    Senior couple using a digital tablet — Stock Photo
    Senior couple using a digital tablet
    Rear view of a young African schoolchildren raising their hands to answer a question to the female teacher standing at the front of the class by the blackboard during a lesson in a township elementary school classroom — Stock Photo
    Rear view of a young African schoolchildren raising their hands to answer a question to the female teacher standing at the front of the class by the blackboard during a lesson in a township elementary school classroom
    Students holding long rocket — Stock Photo
    Students holding long rocket
    Diver asking buddy how much air he has left using hand signal — Stock Photo
    Diver asking buddy how much air he has left using hand signal
    Businesswoman leading conference presentation, answering audience questions — Stock Photo
    Businesswoman leading conference presentation, answering audience questions