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    Smiling female science teacher leading lesson at projection screen in classroom — Stock Photo
    Smiling female science teacher leading lesson at projection screen in classroom
    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
    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
    Smiling business people asking a question in conference audience — Stock Photo
    Smiling business people asking a question in conference audience
    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.
    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.
    Girl in a science class — Stock Photo
    Girl in a science class
    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
    Student writing formula and equations — Stock Photo
    Student writing formula and equations
    Students holding long rocket — Stock Photo
    Students holding long rocket
    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
    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
    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
    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
    Successful adult business people talking in meeting — Stock Photo
    Successful adult business people talking in meeting
    Students on a science lesson — Stock Photo
    Students on a science lesson
    Group of students and a teacher — Stock Photo
    Group of students and a teacher
    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
    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
    College student raising hand in computer lab classroom — Stock Photo
    College student raising hand in computer lab classroom
    Senior couple using a digital tablet — Stock Photo
    Senior couple using a digital tablet
    Senior couple using a digital tablet — Stock Photo
    Senior couple using a digital tablet
    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 male speaker answering audience questions — Stock Photo
    Smiling male speaker answering audience questions
    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
    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
    Teacher calling on student with hand raised in adult education classroom — Stock Photo
    Teacher calling on student with hand raised in adult education classroom
    Three people at a table with digital tablet — Stock Photo
    Three people at a table with digital tablet
    Girl rising hand up and answer to teacher — Stock Photo
    Girl rising hand up and answer to teacher
    Teacher calling on students with hands raised in adult education classroom — Stock Photo
    Teacher calling on students with hands raised in adult education classroom
    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
    Curve ahead roadsigns bunched together against cedar shingled wall — Stock Photo
    Curve ahead roadsigns bunched together against cedar shingled wall
    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
    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 teaching alphabet with students — Stock Photo
    Teacher teaching alphabet with students
    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
    Boy writing scientific equations — Stock Photo
    Boy writing scientific equations
    Close up of wooden cube with question mark — Stock Photo
    Close up of wooden cube with question mark
    Students around a desk on a science lesson — Stock Photo
    Students around a desk on a science lesson
    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
    Girl holding a rocket trophy — Stock Photo
    Girl holding a rocket trophy
    Raw T-bone steak — Stock Photo
    Raw T-bone steak
    Senior couple using a digital tablet — Stock Photo
    Senior couple using a digital tablet
    Female speaker with microphone answering audience questions — Stock Photo
    Female speaker with microphone answering audience questions
    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.
    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
    Tower of atoms bonded together — Stock Photo
    Tower of atoms bonded together
    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 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
    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