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    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
    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
    Businesswoman leading conference presentation, answering audience questions — Stock Photo
    Businesswoman leading conference presentation, answering audience questions
    Group of students on science lesson — Stock Photo
    Group of students on science lesson
    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 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
    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
    Students around a desk on a science lesson — Stock Photo
    Students around a desk on a science lesson
    Question mark under judge gavel — Stock Photo
    Question mark under judge gavel
    Smiling female science teacher leading lesson at projection screen in classroom — Stock Photo
    Smiling female science teacher leading lesson at projection screen in 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
    Three people at a table — Stock Photo
    Three people at a table
    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
    Smiling male speaker answering audience questions — Stock Photo
    Smiling male speaker answering audience questions
    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
    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
    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
    Smiling, eager girl student asking a question in classroom — Stock Photo
    Smiling, eager girl student asking a question in classroom
    Businessman talking in meeting — Stock Photo
    Businessman talking in meeting
    Smiling stylish blonde woman strolling on desert landscape holding hands of surprised toddler with curly hair at daytime — Stock Photo
    Smiling stylish blonde woman strolling on desert landscape holding hands of surprised toddler with curly hair at daytime
    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
    Man looking out from question mark — Stock Photo
    Man looking out from question mark
    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 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
    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
    Smiling business people asking a question in conference audience — Stock Photo
    Smiling business people asking a question in conference audience
    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
    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
    Students in class raising hands — Stock Photo
    Students in class raising hands
    Girl rising hand up and answer to teacher — Stock Photo
    Girl rising hand up and answer to teacher
    Curve ahead roadsigns bunched together against cedar shingled wall — Stock Photo
    Curve ahead roadsigns bunched together against cedar shingled wall
    Students at a Green Science Fair event. — Stock Photo
    Students at a Green Science Fair event.
    Children at a Green Science Fair event — Stock Photo
    Children at a Green Science Fair event
    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
    Boy writing scientific equations — Stock Photo
    Boy writing scientific equations
    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
    Boy at Green Science Fair sign — Stock Photo
    Boy at Green Science Fair sign
    Businesswoman leading conference presentation, answering audience questions — Stock Photo
    Businesswoman leading conference presentation, answering audience questions
    Man talking at press conference — Stock Photo
    Man talking at press conference
    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
    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
    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
    Students in class raising hands — Stock Photo
    Students in class raising hands
    Boy looking at a board — Stock Photo
    Boy looking at a board
    Student writing formula and equations — Stock Photo
    Student writing formula and equations
    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
    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
    Question mark syringe above pram in front of waiting room — Stock Photo
    Question mark syringe above pram in front of waiting room
    Students holding long rocket — Stock Photo
    Students holding long rocket
    Successful adult business people talking in office — Stock Photo
    Successful adult business people talking in office
    Teacher teaching alphabet with students — Stock Photo
    Teacher teaching alphabet with students
    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
    Three children standing behind presentations — Stock Photo
    Three children standing behind presentations
    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