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    Senior couple using a digital tablet — Stock Photo
    Senior couple using a digital tablet
    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
    Student writing formula — Stock Photo
    Student writing formula
    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
    Students using laptops in a lesson. — Stock Photo
    Students using laptops in a lesson.
    Junior high school student raising hand, asking a question during lesson in classroom — Stock Photo
    Junior high school student raising hand, asking a question during lesson in classroom
    Male speaker on stage answering audience questions — Stock Photo
    Male speaker on stage answering audience questions
    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
    Teacher and students with hands raised in adult education class — Stock Photo
    Teacher and students with hands raised in adult education 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
    Teacher calling on students with hands raised in adult education classroom — Stock Photo
    Teacher calling on students with hands raised in adult education classroom
    Female speaker on stage answering audience questions — Stock Photo
    Female speaker on stage answering audience questions
    Senior couple using a digital tablet — Stock Photo
    Senior couple using a digital tablet
    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
    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
    Close-up of senior man playing puzzle game at home — Stock Photo
    Close-up of senior man playing puzzle game at home
    Elderly woman with her young granddaughter at home looking at memory in family photo album — Stock Photo
    Elderly woman with her young granddaughter at home looking at memory in family photo album
    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
    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 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
    Boy holding a molecular structure model — Stock Photo
    Boy holding a molecular structure model
    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
    Close-up of wooden dice on a wooden table — Stock Photo
    Close-up of wooden dice on a wooden table
    Male teacher calling on students in classroom — Stock Photo
    Male teacher calling on students in classroom
    Businesswoman leading meeting, answering audience questions — Stock Photo
    Businesswoman leading meeting, answering audience questions
    Tower of atoms bonded together — Stock Photo
    Tower of atoms bonded together
    Speaker on stage answering audience questions — Stock Photo
    Speaker on stage answering audience questions
    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
    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
    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
    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 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
    Student writing formula and equations — Stock Photo
    Student writing formula and equations
    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
    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
    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
    Pupils gathered around a molecular model — Stock Photo
    Pupils gathered around a molecular model
    Female teacher in hijab answering student questions in classroom — Stock Photo
    Female teacher in hijab answering student questions in classroom
    Girl holding a rocket trophy — Stock Photo
    Girl holding a rocket trophy
    Senior couple using a digital tablet — Stock Photo
    Senior couple using a digital tablet
    High school students with arms raised, asking questions in classroom — Stock Photo
    High school students with arms raised, asking questions in classroom
    Boy looking up at a display of the planets — Stock Photo
    Boy looking up at a display of the planets
    Group of students and a teacher — Stock Photo
    Group of students and a teacher
    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 pushing table at Science Fair — Stock Photo
    Boy pushing table at Science Fair
    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
    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 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
    Senior couple playing jigsaw puzzle at home — Stock Photo
    Senior couple 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
    Student writing formula — Stock Photo
    Student writing formula
    Businesswoman in audience asking question at business conference — Stock Photo
    Businesswoman in audience asking question at business conference
    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
    Successful adult business people talking in meeting — Stock Photo
    Successful adult business people talking in meeting
    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
    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
    Raw T-bone steak — Stock Photo
    Raw T-bone steak
    Senior couple using a digital tablet — Stock Photo
    Senior couple using a digital tablet
    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