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    Woman with microphone asking question in audience at conference — Stock Photo
    Woman with microphone asking question in audience at conference
    Chinese schoolgirl asking teacher a question — Stock Photo
    Chinese schoolgirl asking teacher a question
    Group of students and a teacher — Stock Photo
    Group of students and a teacher
    Boy examining a molecular structure — Stock Photo
    Boy examining a molecular structure
    Three people at a table — Stock Photo
    Three people at a table
    Elegant adult male performer in classy suit and with makeup appealing and making question gesture while sitting at table and looking at camera — Stock Photo
    Elegant adult male performer in classy suit and with makeup appealing and making question gesture while sitting at table and looking at camera
    African american student raising hand in class — Stock Photo
    African american student raising hand in class
    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
    Girl ready to answer a question. — Stock Photo
    Girl ready to answer a question.
    Teacher teaching alphabet with students — Stock Photo
    Teacher teaching alphabet with students
    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
    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
    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
    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
    Students at a Green Science Fair event. — Stock Photo
    Students at a Green Science Fair event.
    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
    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
    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
    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
    A group of Caucasian boys and girls at a boot camp on a sunny day, sitting on the grass, smiling and raising their hands, volunteering to an unseen fitness coach — Stock Photo
    A group of Caucasian boys and girls at a boot camp on a sunny day, sitting on the grass, smiling and raising their hands, volunteering to an unseen fitness coach
    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
    Mid section of senior woman playing jigsaw puzzle at home — Stock Photo
    Mid section of senior woman playing jigsaw puzzle at home
    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.
    Student writing formula and equations — Stock Photo
    Student writing formula and equations
    Boy ready to answer a question. — Stock Photo
    Boy ready to answer a question.
    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 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 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
    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 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
    Girl ready to answer a question. — Stock Photo
    Girl ready to answer a question.
    Group of children in a classroom — Stock Photo
    Group of children in a classroom
    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 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
    Students on a science lesson — Stock Photo
    Students on a science lesson
    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
    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.
    Students around a desk on a science lesson — Stock Photo
    Students around a desk on a science 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
    Boy writing scientific equations — Stock Photo
    Boy writing scientific equations
    Businessmen talking in office while sitting at table — Stock Photo
    Businessmen talking in office while sitting at table
    Businesswoman leading conference presentation, answering audience questions — Stock Photo
    Businesswoman leading conference presentation, answering audience questions
    Male teacher leading physics lesson at whiteboard in classroom — Stock Photo
    Male teacher leading physics lesson at whiteboard in classroom
    Doctor questioning patient and writing on clipboard — Stock Photo
    Doctor questioning patient and writing on clipboard
    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
    Male teacher calling on students in classroom — Stock Photo
    Male teacher calling on students in classroom
    Students using laptops in a lesson. — Stock Photo
    Students using laptops in a lesson.
    Girl in a science class — Stock Photo
    Girl in a science class
    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
    Businessman talking in meeting — Stock Photo
    Businessman talking in meeting
    Girl holding a model of a helix structure — Stock Photo
    Girl holding a model of a helix structure
    Businesswoman in audience asking question at business conference — Stock Photo
    Businesswoman in audience asking question at business conference
    Smiling, eager girl student asking a question in classroom — Stock Photo
    Smiling, eager girl student asking a question 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
    Children Green Science Fair event. — Stock Photo
    Children Green Science Fair event.
    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
    College student raising hand in computer lab classroom — Stock Photo
    College student raising hand in computer lab classroom
    Speaker on stage answering audience questions — Stock Photo
    Speaker on stage answering audience questions