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    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
    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 at Green Science Fair sign — Stock Photo
    Boy at Green Science Fair sign
    Three people at a table with digital tablet — Stock Photo
    Three people at a table with digital tablet
    Doubting stylish male in suit sitting table in posh room and looking away — Stock Photo
    Doubting stylish male in suit sitting table in posh room and looking away
    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
    African american student raising hand in class — Stock Photo
    African american student raising hand in class
    Children at a Green Science Fair event — Stock Photo
    Children at a Green Science Fair event
    Two carrots on white background — Stock Photo
    Two carrots on white background
    Close-up of wooden dice on a wooden table — Stock Photo
    Close-up of wooden dice on a wooden table
    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 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
    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 a schoolgirl is 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 a schoolgirl is 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.
    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
    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
    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
    Senior couple using a digital tablet — Stock Photo
    Senior couple using a digital tablet
    Group of children in a classroom — Stock Photo
    Group of children in a classroom
    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
    Front view of a middle aged African female school teacher standing at the front of the class in front of the blackboard with the rear view of pupils sitting at their desks with hands raised in the foreground during a lesson — Stock Photo
    Front view of a middle aged African female school teacher standing at the front of the class in front of the blackboard with the rear view of pupils sitting at their desks with hands raised in the foreground during a lesson
    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
    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
    Curve ahead roadsigns bunched together against cedar shingled wall — Stock Photo
    Curve ahead roadsigns bunched together against cedar shingled wall
    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
    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
    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 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 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
    Student writing formula and equations — Stock Photo
    Student writing formula and equations
    Girl holding a rocket trophy — Stock Photo
    Girl holding a rocket trophy
    Businesswoman leading conference presentation, answering audience questions — Stock Photo
    Businesswoman leading conference presentation, answering audience questions
    Lettuce leaves on white — Stock Photo
    Lettuce leaves on white
    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
    Boy examining a molecular structure — Stock Photo
    Boy examining a molecular structure
    Smiling female science teacher leading lesson at projection screen in classroom — Stock Photo
    Smiling female science teacher leading lesson at projection screen in classroom
    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
    Group of children in a classroom — Stock Photo
    Group of children in a classroom
    Raw T-bone steak — Stock Photo
    Raw T-bone steak
    Girl rising hand up and answer to teacher — Stock Photo
    Girl rising hand up and answer to teacher
    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
    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 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
    Senior couple using a digital tablet — Stock Photo
    Senior couple using a digital tablet
    Girl in a science class — Stock Photo
    Girl in a science class
    Mid section of senior woman playing jigsaw puzzle at home — Stock Photo
    Mid section of senior woman playing jigsaw puzzle at home
    Boy looking up at a display of the planets — Stock Photo
    Boy looking up at a display of the planets
    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.
    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
    Question mark syringe above pram in front of waiting room — Stock Photo
    Question mark syringe above pram in front of waiting room
    Teacher calling on students with hands raised in adult education classroom — Stock Photo
    Teacher calling on students with hands raised in adult education classroom
    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
    Group making scientific models — Stock Photo
    Group making scientific models
    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
    Winning a trophy at the Green Science Fair. — Stock Photo
    Winning a trophy at the Green Science Fair.
    Smiling business people asking a question in conference audience — Stock Photo
    Smiling business people asking a question in conference audience
    Businesswoman in audience asking question at business conference — Stock Photo
    Businesswoman in audience asking question at business conference
    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
    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.