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    Smiling business people asking a question in conference audience — Stock Photo
    Smiling business people asking a question in conference audience
    Businesswoman leading conference presentation, answering audience questions — Stock Photo
    Businesswoman leading conference presentation, answering audience questions
    African american student raising hand in class — Stock Photo
    African american student raising hand in class
    Girl in a science class — Stock Photo
    Girl in a science class
    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
    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
    Businesswoman leading conference presentation, answering audience questions — Stock Photo
    Businesswoman leading conference presentation, answering audience questions
    Raw T-bone steak — Stock Photo
    Raw T-bone steak
    Boy looking up at a display of the planets — Stock Photo
    Boy looking up at a display of the planets
    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
    Businesswoman leading conference presentation, answering audience questions — Stock Photo
    Businesswoman leading conference presentation, answering audience questions
    Student writing formula and equations — Stock Photo
    Student writing formula and equations
    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
    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 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
    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
    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 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.
    Smiling male speaker answering audience questions — Stock Photo
    Smiling male speaker answering audience questions
    College students raising hands in science laboratory classroom — Stock Photo
    College students raising hands in science laboratory classroom
    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
    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
    Smiling, eager girl student asking a question in classroom — Stock Photo
    Smiling, eager girl student asking a question in classroom
    Boy at Green Science Fair sign — Stock Photo
    Boy at Green Science Fair sign
    Question mark key on computer keyboard, close-up — Stock Photo
    Question mark key on computer keyboard, close-up
    Students on a science lesson — Stock Photo
    Students on a science lesson
    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
    Girl holding a model of a helix structure — Stock Photo
    Girl holding a model of a helix structure
    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
    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
    Teacher calling on students with hands raised in adult education classroom — Stock Photo
    Teacher calling on students with hands raised in adult education classroom
    Male teacher leading physics lesson at whiteboard in classroom — Stock Photo
    Male teacher leading physics lesson at whiteboard in classroom
    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
    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
    Winning a trophy at the Green Science Fair. — Stock Photo
    Winning a trophy at the Green Science Fair.
    Doctor questioning patient and writing on clipboard — Stock Photo
    Doctor questioning patient and writing on clipboard
    Students at a Green Science Fair event. — Stock Photo
    Students at a Green Science Fair event.
    Children Green Science Fair event. — Stock Photo
    Children Green Science Fair event.
    Pupils gathered around a molecular model — Stock Photo
    Pupils gathered around a molecular model
    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
    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
    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
    Front view of two young African schoolgirls sitting at their desk, one raising her hand to answer a question and the other writing in her notebook during a lesson — Stock Photo
    Front view of two young African schoolgirls sitting at their desk, one raising her hand to answer a question and the other writing in her notebook during a lesson
    Boy pushing table at Science Fair — Stock Photo
    Boy pushing table at Science Fair
    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
    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 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.
    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
    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
    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
    Close-up of wooden dice on a wooden table — Stock Photo
    Close-up of wooden dice on a wooden table
    Students holding long rocket — Stock Photo
    Students holding long rocket
    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
    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
    Female speaker with microphone answering audience questions — Stock Photo
    Female speaker with microphone answering audience questions
    Student writing formula and equations — Stock Photo
    Student writing formula and equations
    Girl in a science class — Stock Photo
    Girl in a science class
    Rear view of pupils sitting at their desks with hands raised during a lesson in a township elementary school classroom with their teacher standing writing on the blackboard in the background — Stock Photo
    Rear view of pupils sitting at their desks with hands raised during a lesson in a township elementary school classroom with their teacher standing writing on the blackboard in the background
    Tower of atoms bonded together — Stock Photo
    Tower of atoms bonded together