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    Girl rising hand up and answer to teacher — Stock Photo
    Girl rising hand up and answer to teacher
    Girl in a science class — Stock Photo
    Girl in a science class
    Senior couple using a digital tablet — Stock Photo
    Senior couple using a digital tablet
    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
    Three people at a table with digital tablet — Stock Photo
    Three people at a table with digital tablet
    Student writing formula and equations — Stock Photo
    Student writing formula and equations
    Students holding long rocket — Stock Photo
    Students holding long rocket
    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
    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
    Portrait of thoughtful doubtful beautiful curly haired female in trendy head wrap looking at camera against yellow background — Stock Photo
    Portrait of 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 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
    Elderly woman with her young granddaughter at home looking at memory in family photo album — Stock Photo
    Elderly woman with her young granddaughter at home looking at memory in family photo album
    College student raising hand in computer lab classroom — Stock Photo
    College student raising hand in computer lab 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
    Mid section of senior woman playing jigsaw puzzle at home — Stock Photo
    Mid section of senior woman playing jigsaw puzzle at home
    Woman with microphone asking question in audience at conference — Stock Photo
    Woman with microphone asking question in audience at conference
    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
    Man using a digital tablet — Stock Photo
    Man using a digital tablet
    Children at a Green Science Fair event — Stock Photo
    Children at a Green Science Fair event
    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
    Senior couple using a digital tablet — Stock Photo
    Senior couple using a digital tablet
    Young ethnic man making grimace doubting face looking at camera wearing trendy denim jacket with floral pattern while standing against gray background — Stock Photo
    Young ethnic man making grimace doubting face looking at camera wearing trendy denim jacket with floral pattern while standing against gray background
    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
    Close up of wooden cube with question mark — Stock Photo
    Close up of wooden cube with question mark
    Businesswoman leading conference presentation, answering audience questions — Stock Photo
    Businesswoman leading conference presentation, answering audience questions
    Question mark under judge gavel — Stock Photo
    Question mark under judge gavel
    Three children standing behind presentations — Stock Photo
    Three children standing behind presentations
    Pupils gathered around a molecular model — Stock Photo
    Pupils gathered around a molecular model
    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
    Children Green Science Fair event. — Stock Photo
    Children Green Science Fair event.
    Senior couple playing jigsaw puzzle at home — Stock Photo
    Senior couple playing jigsaw puzzle at home
    Teacher calling on students with hands raised in adult education classroom — Stock Photo
    Teacher calling on students with hands raised in adult education classroom
    Students on a science lesson — Stock Photo
    Students on a science lesson
    Teacher teaching alphabet with students — Stock Photo
    Teacher teaching alphabet with students
    Curve ahead roadsigns bunched together against cedar shingled wall — Stock Photo
    Curve ahead roadsigns bunched together against cedar shingled wall
    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
    Smiling, eager girl student asking a question in classroom — Stock Photo
    Smiling, eager girl student asking a question in classroom
    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
    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
    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
    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
    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
    Man looking out from question mark — Stock Photo
    Man looking out from question mark
    Smiling female science teacher leading lesson at projection screen in classroom — Stock Photo
    Smiling female science teacher leading lesson at projection screen in 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
    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
    High school students with arms raised, asking questions in classroom — Stock Photo
    High school students with arms raised, asking questions in classroom
    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
    Side view of a multi-ethnic group of boy soccer players sitting a playing field on a sunny day listening to their mixed race male coach during a soccer training session, one boy raising his hand to ask a question — Stock Photo
    Side view of a multi-ethnic group of boy soccer players sitting a playing field on a sunny day listening to their mixed race male coach during a soccer training session, one boy raising his hand to ask a question
    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
    Students in class raising hands — Stock Photo
    Students in class raising hands
    Female teacher in hijab answering student questions in classroom — Stock Photo
    Female teacher in hijab answering student questions in 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
    Young ethnic bearded man with trendy hairdo dressed in denim jacket pointing at camera with challenge while standing against gray background — Stock Photo
    Young ethnic bearded man with trendy hairdo dressed in denim jacket pointing at camera with challenge while standing against gray background
    Students around a desk on a science lesson — Stock Photo
    Students around a desk on a science lesson
    Smiling business people asking a question in conference audience — Stock Photo
    Smiling business people asking a question in conference audience
    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 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