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    Students around a desk on a science lesson — Stock Photo
    Students around a desk on a science lesson
    Woman with microphone asking question in audience at conference — Stock Photo
    Woman with microphone asking question in audience at conference
    Senior couple using a digital tablet — Stock Photo
    Senior couple using a digital tablet
    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
    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
    Man talking at press conference — Stock Photo
    Man talking at press conference
    Girl rising hand up and answer to teacher — Stock Photo
    Girl rising hand up and answer to teacher
    Three people at a table — Stock Photo
    Three people at a table
    Chinese schoolgirl asking teacher a question — Stock Photo
    Chinese schoolgirl asking teacher a question
    Group of students on science lesson — Stock Photo
    Group of students on science lesson
    Successful adult business people sitting in meeting — Stock Photo
    Successful adult business people sitting in meeting
    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
    Close-up of wooden dice on a wooden table — Stock Photo
    Close-up of wooden dice on a wooden table
    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
    Male teacher leading physics lesson at whiteboard in classroom — Stock Photo
    Male teacher leading physics lesson at whiteboard in classroom
    Close up of wooden cube with question mark — Stock Photo
    Close up of wooden cube with question mark
    Tower of atoms bonded together — Stock Photo
    Tower of atoms bonded together
    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
    Smiling male speaker answering audience questions — Stock Photo
    Smiling male speaker answering audience questions
    Student writing formula and equations — Stock Photo
    Student writing formula and equations
    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
    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
    Boy at Green Science Fair sign — Stock Photo
    Boy at Green Science Fair sign
    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
    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
    Boy examining a molecular structure — Stock Photo
    Boy examining a molecular structure
    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
    Winning a trophy at the Green Science Fair. — Stock Photo
    Winning a trophy at the Green Science Fair.
    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
    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
    Raw T-bone steak — Stock Photo
    Raw T-bone steak
    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.
    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
    Girl in a science class — Stock Photo
    Girl in a science class
    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
    Doctor questioning patient and writing on clipboard — Stock Photo
    Doctor questioning patient and writing on clipboard
    Curve ahead roadsigns bunched together against cedar shingled wall — Stock Photo
    Curve ahead roadsigns bunched together against cedar shingled wall
    Mid section of senior woman playing jigsaw puzzle at home — Stock Photo
    Mid section of senior woman playing jigsaw puzzle at home
    Students at a Green Science Fair event. — Stock Photo
    Students at a Green Science Fair event.
    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
    Eager audience asking questions — Stock Photo
    Eager audience asking questions
    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
    Girl holding a model of a helix structure — Stock Photo
    Girl holding a model of a helix structure
    Students using laptops in a lesson. — Stock Photo
    Students using laptops in a lesson.
    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
    Two carrots on white background — Stock Photo
    Two carrots on white background
    Students in class raising hands — Stock Photo
    Students in class raising hands
    Senior couple playing jigsaw puzzle at home — Stock Photo
    Senior couple playing jigsaw puzzle at home
    Businesswoman leading conference presentation, answering audience questions — Stock Photo
    Businesswoman leading conference presentation, answering audience questions
    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
    Female teacher in hijab answering student questions in classroom — Stock Photo
    Female teacher in hijab answering student questions in classroom
    Teacher teaching alphabet with students — Stock Photo
    Teacher teaching alphabet with students
    Woman awarding a rosette badge to a student — Stock Photo
    Woman awarding a rosette badge to a student
    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
    Student writing formula and equations — Stock Photo
    Student writing formula and equations
    Businessman talking in meeting — Stock Photo
    Businessman talking in meeting
    Children Green Science Fair event. — Stock Photo
    Children Green Science Fair event.
    Lettuce leaves on white — Stock Photo
    Lettuce leaves on white
    Businesswoman in audience asking question at business conference — Stock Photo
    Businesswoman in audience asking question at business conference