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    African american student raising hand in class — Stock Photo
    African american student raising hand in class
    Rear view of multi-ethnic group of high school teenagers in a school classroom sitting at desks, all raising their hands to answer a question, their male teacher standing in the background — Stock Photo
    Rear view of multi-ethnic group of high school teenagers in a school classroom sitting at desks, all raising their hands to answer a question, their male teacher standing in the background
    Close-up of wooden dice on a wooden table — Stock Photo
    Close-up of wooden dice on a wooden table
    Teacher calling on student with hand raised in adult education classroom — Stock Photo
    Teacher calling on student with hand raised in adult education classroom
    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
    Successful adult business people talking in meeting — Stock Photo
    Successful adult business people talking in meeting
    Students in class raising hands — Stock Photo
    Students in class raising hands
    Businessman talking in meeting — Stock Photo
    Businessman talking in meeting
    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
    Three people at a table with digital tablet — Stock Photo
    Three people at a table with digital tablet
    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.
    Smiling, eager girl student asking a question in classroom — Stock Photo
    Smiling, eager girl student asking a question in classroom
    Man talking at press conference — Stock Photo
    Man talking at press conference
    A sad little blonde girl with a questioning look in her eyes — Stock Photo
    A sad little blonde girl with a questioning look in her eyes
    Successful adult business people sitting in meeting — Stock Photo
    Successful adult business people sitting in meeting
    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 close up of a young African schoolboy sitting at a desk and raising his hand to answer a question during a lesson in a township elementary school classroom, in the background is a world map and the blackboard — Stock Photo
    Front view close up of a young African schoolboy sitting at a desk and raising his hand to answer a question during a lesson in a township elementary school classroom, in the background is a world map and the blackboard
    Senior couple using a digital tablet — Stock Photo
    Senior couple using a digital tablet
    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
    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
    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
    Boy ready to answer a question. — Stock Photo
    Boy ready to answer a question.
    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
    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
    Senior couple using a digital tablet — Stock Photo
    Senior couple using a digital tablet
    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
    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
    Student writing formula and equations — Stock Photo
    Student writing formula and equations
    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
    Group of children in a classroom — Stock Photo
    Group of children in a classroom
    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
    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
    Senior couple using a digital tablet — Stock Photo
    Senior couple using a digital tablet
    Businesswoman in audience asking question at business conference — Stock Photo
    Businesswoman in audience asking question at business conference
    Group of students on science lesson — Stock Photo
    Group of students on science lesson
    Three people at a table — Stock Photo
    Three people at a table
    Portrait of young ethnic looking at camera wearing trendy denim jacket with floral pattern while standing against gray background — Stock Photo
    Portrait of young ethnic looking at camera wearing trendy denim jacket with floral pattern while standing against gray background
    Three children standing behind presentations — Stock Photo
    Three children standing behind presentations
    Group of children in a classroom — Stock Photo
    Group of children in a classroom
    Winning a trophy at the Green Science Fair. — Stock Photo
    Winning a trophy at the Green Science Fair.
    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
    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
    Mid section of senior woman playing jigsaw puzzle at home — Stock Photo
    Mid section of senior woman playing jigsaw puzzle at home
    Question mark under judge gavel — Stock Photo
    Question mark under judge gavel
    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
    Group making scientific models — Stock Photo
    Group making scientific models
    Egypt, Cairo Governorate, Cairo, view from the Minaret of the Ibn Tulun Mosque — Stock Photo
    Egypt, Cairo Governorate, Cairo, view from the Minaret of the Ibn Tulun Mosque
    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
    College students raising hands in science laboratory classroom — Stock Photo
    College students raising hands in science laboratory classroom
    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
    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
    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
    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
    Boy looking at a board — Stock Photo
    Boy looking at a board
    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
    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
    Woman with microphone asking question in audience at conference — Stock Photo
    Woman with microphone asking question in audience at conference
    Smiling business people asking a question in conference audience — Stock Photo
    Smiling business people asking a question in conference audience
    Boy holding a molecular structure model — Stock Photo
    Boy holding a molecular structure model