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    Teacher and students with hands raised in adult education class — Stock Photo
    Teacher and students with hands raised in adult education class
    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
    Students at a Green Science Fair event. — Stock Photo
    Students at a Green Science Fair event.
    Students using laptops in a lesson. — Stock Photo
    Students using laptops in a lesson.
    Group of students and a teacher — Stock Photo
    Group of students and a teacher
    Male teacher leading physics lesson at whiteboard in classroom — Stock Photo
    Male teacher leading physics lesson at whiteboard 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
    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, in the foreground two schoolgirls are 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, in the foreground two schoolgirls are listening attentively
    Side view close up of a young African schoolboy sitting at his desk and turning around, looking to camera and smiling during a lesson in a township elementary school classroom. — Stock Photo
    Side view close up of a young African schoolboy sitting at his desk and turning around, looking to camera and smiling during a lesson in a township elementary school classroom.
    Student writing formula and equations — Stock Photo
    Student writing formula and equations
    Group making scientific models — Stock Photo
    Group making scientific models
    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
    Woman awarding a rosette badge to a student — Stock Photo
    Woman awarding a rosette badge to a student
    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
    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
    Winning a trophy at the Green Science Fair. — Stock Photo
    Winning a trophy at the Green Science Fair.
    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
    Student writing formula — Stock Photo
    Student writing formula
    Teacher calling on student with hand raised in adult education classroom — Stock Photo
    Teacher calling on student with hand raised in adult education classroom
    Boy looking at a board — Stock Photo
    Boy looking at a board
    Businessmen talking in office while sitting at table — Stock Photo
    Businessmen talking in office while sitting at table
    Group of students on science lesson — Stock Photo
    Group of students on science lesson
    Close-up of wooden dice on a wooden table — Stock Photo
    Close-up of wooden dice on a wooden table
    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
    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
    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
    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
    African american student raising hand in class — Stock Photo
    African american student raising hand in class
    Businesswoman leading meeting, answering audience questions — Stock Photo
    Businesswoman leading meeting, answering audience questions
    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.
    Boy looking up at a display of the planets — Stock Photo
    Boy looking up at a display of the planets
    Successful adult business people talking in office — Stock Photo
    Successful adult business people talking in office
    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
    Boy examining a molecular structure — Stock Photo
    Boy examining a molecular structure
    Businesswoman in audience asking question at business conference — Stock Photo
    Businesswoman in audience asking question at business conference
    Smiling male speaker answering audience questions — Stock Photo
    Smiling male speaker answering audience questions
    Front view of a multi-ethnic group of teenage school pupils sitting at desks in a classroom and raising their hands — Stock Photo
    Front view of a multi-ethnic group of teenage school pupils sitting at desks in a classroom and raising their hands
    High school girl student raising hand, asking question during lesson in classroom — Stock Photo
    High school girl student raising hand, asking question during lesson in classroom
    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
    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
    Successful adult business people talking in meeting — Stock Photo
    Successful adult business people talking 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
    Close-up of senior man playing puzzle game at home — Stock Photo
    Close-up of senior man playing puzzle game at home
    Student writing formula and equations — Stock Photo
    Student writing formula and equations
    Boy writing scientific equations — Stock Photo
    Boy writing scientific equations
    Question mark key on computer keyboard, close-up — Stock Photo
    Question mark key on computer keyboard, close-up
    Student writing formula — Stock Photo
    Student writing formula
    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
    Handing over house key with question mark — Stock Photo
    Handing over house key with question mark
    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 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
    Male speaker on stage answering audience questions — Stock Photo
    Male speaker on stage answering audience questions
    Doctor questioning patient and writing on clipboard — Stock Photo
    Doctor questioning patient and writing on clipboard
    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