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    Teacher calling on student with hand raised in adult education classroom — Stock Photo
    Teacher calling on student with hand raised in adult education classroom
    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
    Businesswoman asking question in conference audience — Stock Photo
    Businesswoman asking question in conference audience
    Successful adult business people sitting in meeting — Stock Photo
    Successful adult business people sitting in meeting
    Teacher calling on students with hands raised in adult education classroom — Stock Photo
    Teacher calling on students with hands raised in adult education classroom
    Successful adult business people talking in meeting — Stock Photo
    Successful adult business people talking in meeting
    Businesswoman leading conference presentation, answering audience questions — Stock Photo
    Businesswoman leading conference presentation, answering audience questions
    Successful adult business people talking in meeting — Stock Photo
    Successful adult business people talking in meeting
    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
    Lettuce leaves on white — Stock Photo
    Lettuce leaves on white
    Raw T-bone steak — Stock Photo
    Raw T-bone steak
    Teacher teaching alphabet with students — Stock Photo
    Teacher teaching alphabet with students
    Girl rising hand up and answer to teacher — Stock Photo
    Girl rising hand up and answer to teacher
    Students in class raising hands — Stock Photo
    Students in class raising hands
    Students in class raising hands — Stock Photo
    Students in class raising hands
    Boy writing scientific equations — Stock Photo
    Boy writing scientific equations
    Three people at a table — Stock Photo
    Three people at a table
    Students using laptops in a lesson. — Stock Photo
    Students using laptops in a lesson.
    Girl holding a model of a helix structure — Stock Photo
    Girl holding a model of a helix structure
    Students on a science lesson — Stock Photo
    Students on a science lesson
    Three children standing behind presentations — Stock Photo
    Three children standing behind presentations
    Boy pushing table at Science Fair — Stock Photo
    Boy pushing table at Science Fair
    Winning a trophy at the Green Science Fair. — Stock Photo
    Winning a trophy at the Green Science Fair.
    Student writing formula and equations — Stock Photo
    Student writing formula and equations
    Group of students on science lesson — Stock Photo
    Group of students on science lesson
    Boy looking up at a display of the planets — Stock Photo
    Boy looking up at a display of the planets
    Group making scientific models — Stock Photo
    Group making scientific models
    Boy examining a molecular structure — Stock Photo
    Boy examining a molecular structure
    Three people at a table with digital tablet — Stock Photo
    Three people at a table with digital tablet
    Pupils gathered around a molecular model — Stock Photo
    Pupils gathered around a molecular model
    Senior couple using a digital tablet — Stock Photo
    Senior couple using a digital tablet
    Girl holding a rocket trophy — Stock Photo
    Girl holding a rocket trophy
    Student writing formula — Stock Photo
    Student writing formula
    Students on a science lesson — Stock Photo
    Students on a science lesson
    Student writing formula — Stock Photo
    Student writing formula
    Woman awarding a rosette badge to a student — Stock Photo
    Woman awarding a rosette badge to a student
    Students holding long rocket — Stock Photo
    Students holding long rocket
    Group of students and a teacher — Stock Photo
    Group of students and a teacher
    Boy looking at a board — Stock Photo
    Boy looking at a board
    Boy at Green Science Fair sign — Stock Photo
    Boy at Green Science Fair sign
    Student writing formula and equations — Stock Photo
    Student writing formula and equations
    Students at a Green Science Fair event. — Stock Photo
    Students at a Green Science Fair event.
    Students around a desk on a science lesson — Stock Photo
    Students around a desk on a science lesson
    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
    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
    Man using a digital tablet — Stock Photo
    Man using a digital tablet
    Girl in a science class — Stock Photo
    Girl in a science class
    Children Green Science Fair event. — Stock Photo
    Children Green Science Fair event.
    Student writing formula and equations — Stock Photo
    Student writing formula and equations
    Boy holding a molecular structure model — Stock Photo
    Boy holding a molecular structure model
    Tower of atoms bonded together — Stock Photo
    Tower of atoms bonded together
    Children at a Green Science Fair event — Stock Photo
    Children at a Green Science Fair event