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    Female speaker with microphone answering audience questions — Stock Photo
    Female speaker with microphone answering audience questions
    Male speaker on stage answering audience questions — Stock Photo
    Male speaker on stage answering audience questions
    Students holding long rocket — Stock Photo
    Students holding long rocket
    Boy writing scientific equations — Stock Photo
    Boy writing scientific equations
    Smiling male speaker answering audience questions — Stock Photo
    Smiling male speaker answering audience questions
    Businesswoman asking question in conference audience — Stock Photo
    Businesswoman asking question in conference audience
    Portrait of a red-haired little girl indoors holding her finger in front of the mouth with an inquiring look on her face — Stock Photo
    Portrait of a red-haired little girl indoors holding her finger in front of the mouth with an inquiring look on her face
    Winning a trophy at the Green Science Fair. — Stock Photo
    Winning a trophy at the Green Science Fair.
    Man talking at press conference — Stock Photo
    Man talking at press conference
    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
    Successful adult business people sitting in meeting — Stock Photo
    Successful adult business people sitting in meeting
    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
    Businesswoman leading meeting, answering audience questions — Stock Photo
    Businesswoman leading meeting, answering audience questions
    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
    Boy examining a molecular structure — Stock Photo
    Boy examining a molecular structure
    Businesswoman leading conference presentation, answering audience questions — Stock Photo
    Businesswoman leading conference presentation, answering audience questions
    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
    College students raising hands in science laboratory classroom — Stock Photo
    College students raising hands in science laboratory classroom
    Girl in a science class — Stock Photo
    Girl in a science class
    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
    Man using a digital tablet — Stock Photo
    Man using a digital tablet
    Businesswoman leading conference presentation, answering audience questions — Stock Photo
    Businesswoman leading conference presentation, answering audience questions
    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 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
    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
    Student writing formula — Stock Photo
    Student writing formula
    Senior couple using a digital tablet — Stock Photo
    Senior couple using a digital tablet
    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
    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
    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
    Mid section of senior woman playing jigsaw puzzle at home — Stock Photo
    Mid section of senior woman playing jigsaw puzzle at home
    Three children standing behind presentations — Stock Photo
    Three children standing behind presentations
    Children at a Green Science Fair event — Stock Photo
    Children at a Green Science Fair event
    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
    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
    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 holding a rocket trophy — Stock Photo
    Girl holding a rocket trophy
    Students around a desk on a science lesson — Stock Photo
    Students around a desk on a science lesson
    Successful adult business people talking in meeting — Stock Photo
    Successful adult business people talking in meeting
    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
    Question mark key on computer keyboard, close-up — Stock Photo
    Question mark key on computer keyboard, close-up
    Student writing formula and equations — Stock Photo
    Student writing formula and equations
    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 looking up at a display of the planets — Stock Photo
    Boy looking up at a display of the planets
    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
    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
    Group making scientific models — Stock Photo
    Group making scientific models
    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
    Senior couple using a digital tablet — Stock Photo
    Senior couple using a digital tablet
    Group of students and a teacher — Stock Photo
    Group of students and a teacher
    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
    Female teacher in hijab answering student questions in classroom — Stock Photo
    Female teacher in hijab answering student questions in classroom
    Students on a science lesson — Stock Photo
    Students on a science lesson
    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.
    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
    Teacher calling on students with hands raised in adult education classroom — Stock Photo
    Teacher calling on students with hands raised in adult education classroom
    Diver asking buddy how much air he has left using hand signal — Stock Photo
    Diver asking buddy how much air he has left using hand signal
    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