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    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
    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
    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 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
    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
    From below of classy adult male theater artist in burgundy jacket and with makeup pointing at camera and looking with question and arrogance — Stock Photo
    From below of classy adult male theater artist in burgundy jacket and with makeup pointing at camera and looking with question and arrogance
    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 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
    Boy at Green Science Fair sign — Stock Photo
    Boy at Green Science Fair sign
    Man using a digital tablet — Stock Photo
    Man using a digital tablet
    Close-up of wooden dice on a wooden table — Stock Photo
    Close-up of wooden dice on a wooden table
    Woman with microphone asking question in audience at conference — Stock Photo
    Woman with microphone asking question in audience at conference
    College students raising hands in science laboratory classroom — Stock Photo
    College students raising hands in science laboratory classroom
    Successful adult business people talking in office — Stock Photo
    Successful adult business people talking in office
    Young ethnic bearded man with trendy hairdo dressed in denim jacket pointing at camera with challenge while standing against gray background — Stock Photo
    Young ethnic bearded man with trendy hairdo dressed in denim jacket pointing at camera with challenge while standing against gray background
    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
    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
    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
    Boy holding a molecular structure model — Stock Photo
    Boy holding a molecular structure model
    Student writing formula — Stock Photo
    Student writing formula
    A group of Caucasian boys and girls listening to instructions from a Caucasian male fitness coach at a boot camp on a sunny day, sitting on the grass and raising their hands — Stock Photo
    A group of Caucasian boys and girls listening to instructions from a Caucasian male fitness coach at a boot camp on a sunny day, sitting on the grass and raising their hands
    Businesswoman asking question in conference audience — Stock Photo
    Businesswoman asking question in conference audience
    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
    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 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
    Senior couple using a digital tablet — Stock Photo
    Senior couple using a digital tablet
    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
    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
    Boy looking up at a display of the planets — Stock Photo
    Boy looking up at a display of the planets
    Businesswoman leading conference presentation, answering audience questions — Stock Photo
    Businesswoman leading conference presentation, answering audience questions
    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
    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 rising hand up and answer to teacher — Stock Photo
    Girl rising hand up and answer to teacher
    Doctor questioning patient and writing on clipboard — Stock Photo
    Doctor questioning patient and writing on clipboard
    Teacher and students with hands raised in adult education class — Stock Photo
    Teacher and students with hands raised in adult education class
    Three people at a table — Stock Photo
    Three people at a table
    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
    Tower of atoms bonded together — Stock Photo
    Tower of atoms bonded together
    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
    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 holding a rocket trophy — Stock Photo
    Girl holding a rocket trophy
    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
    Mid section of senior woman playing jigsaw puzzle at home — Stock Photo
    Mid section of senior woman playing jigsaw puzzle at home
    Front view close up of a young African schoolboy sitting at a desk and raising his hand to answer a question during a lesson in a township elementary school classroom, in the background is a world map and the blackboard — Stock Photo
    Front view close up of a young African schoolboy sitting at a desk and raising his hand to answer a question during a lesson in a township elementary school classroom, in the background is a world map and the blackboard
    Group of students and a teacher — Stock Photo
    Group of students and a teacher
    Winning a trophy at the Green Science Fair. — Stock Photo
    Winning a trophy at the Green Science Fair.
    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
    Teacher calling on student with hand raised in adult education classroom — Stock Photo
    Teacher calling on student with hand raised in adult education classroom
    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
    Children Green Science Fair event. — Stock Photo
    Children 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
    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 multi-ethnic group of teenagers in a high school classroom sitting at desks, all raising their hands to answer a question — Stock Photo
    Front view of multi-ethnic group of teenagers in a high school classroom sitting at desks, all raising their hands to answer a question
    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
    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
    Girl ready to answer a question. — Stock Photo
    Girl ready to answer a question.
    Smiling, eager girl student asking a question in classroom — Stock Photo
    Smiling, eager girl student asking a question in classroom
    Children at a Green Science Fair event — Stock Photo
    Children at a Green Science Fair event