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    Boy pushing table at Science Fair — Stock Photo
    Boy pushing table at Science Fair
    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
    Man using a digital tablet — Stock Photo
    Man using a digital tablet
    Question mark syringe above pram in front of waiting room — Stock Photo
    Question mark syringe above pram in front of waiting room
    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
    Winning a trophy at the Green Science Fair. — Stock Photo
    Winning a trophy at the Green Science Fair.
    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
    High school students with hands raised asking questions during lesson in classroom — Stock Photo
    High school students with hands raised asking questions during lesson in classroom
    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
    Children at a Green Science Fair event — Stock Photo
    Children at a Green Science Fair event
    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
    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
    Students in class raising hands — Stock Photo
    Students in class raising hands
    Lettuce leaves on white — Stock Photo
    Lettuce leaves on white
    Rear view of a young African schoolgirl raising her hand to answer a question to the female teacher standing at the front of the class during a lesson in a township elementary school classroom — Stock Photo
    Rear view of a young African schoolgirl raising her hand to answer a question to the female teacher standing at the front of the class during a lesson in a township elementary school classroom
    Junior high school student raising hand, asking a question during lesson in classroom — Stock Photo
    Junior high school student raising hand, asking a question during lesson in classroom
    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
    Speaker on stage answering audience questions — Stock Photo
    Speaker on stage answering audience questions
    High school students with hands raised, asking questions during lesson in classroom — Stock Photo
    High school students with hands raised, asking questions during lesson in classroom
    Students on a science lesson — Stock Photo
    Students on a science lesson
    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
    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 playing jigsaw puzzle at home — Stock Photo
    Senior couple playing jigsaw puzzle at home
    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
    Teacher and students with hands raised in adult education class — Stock Photo
    Teacher and students with hands raised in adult education class
    Businesswoman leading meeting, answering audience questions — Stock Photo
    Businesswoman leading meeting, answering audience questions
    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
    Mid section of senior woman playing jigsaw puzzle at home — Stock Photo
    Mid section of senior woman playing jigsaw puzzle at home
    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
    Female teacher in hijab answering student questions in classroom — Stock Photo
    Female teacher in hijab answering student questions in classroom
    Smiling, eager girl student asking a question in classroom — Stock Photo
    Smiling, eager girl student asking a question in 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
    Close-up of wooden dice on a wooden table — Stock Photo
    Close-up of wooden dice on a wooden table
    Boy holding a molecular structure model — Stock Photo
    Boy holding a molecular structure model
    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 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
    Male teacher calling on students in classroom — Stock Photo
    Male teacher calling on students in classroom
    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
    Children Green Science Fair event. — Stock Photo
    Children Green Science Fair event.
    Smiling stylish blonde woman strolling on desert landscape holding hands of surprised toddler with curly hair at daytime — Stock Photo
    Smiling stylish blonde woman strolling on desert landscape holding hands of surprised toddler with curly hair at daytime
    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
    Three children standing behind presentations — Stock Photo
    Three children standing behind presentations
    Front view of two young African schoolgirls sitting at their desk, one raising her hand to answer a question during a lesson in a township elementary school classroom, in the background their classmates are listening attentively — Stock Photo
    Front view of two young African schoolgirls sitting at their desk, one raising her hand to answer a question during a lesson in a township elementary school classroom, in the background their classmates are listening attentively
    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
    Three people at a table — Stock Photo
    Three people at a table
    Students using laptops in a lesson. — Stock Photo
    Students using laptops in a lesson.
    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 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
    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
    Successful adult business people talking in office — Stock Photo
    Successful adult business people talking in office
    Close-up of senior man playing puzzle game at home — Stock Photo
    Close-up of senior man playing puzzle game at home
    College students raising hands in science laboratory classroom — Stock Photo
    College students raising hands in science laboratory classroom
    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
    Concerned female in sunglasses wearing casual clothes standing with crossed arms against glass wall in Madrid street — Stock Photo
    Concerned female in sunglasses wearing casual clothes standing with crossed arms against glass wall in Madrid street
    Businesswoman asking question in conference audience — Stock Photo
    Businesswoman asking question in conference audience
    African american student raising hand in class — Stock Photo
    African american student raising hand in class
    Woman awarding a rosette badge to a student — Stock Photo
    Woman awarding a rosette badge to a student
    Student writing formula — Stock Photo
    Student writing formula