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Senior chemistry professor/doctor in a lab (color toned image)
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Senior male researcher carrying out scientific research in a lab (shallow DOF; color toned image)
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Senior chemistry professor/doctor in a lab (color toned image)
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Portrait of a female chemistry student carrying out research in a chemistry lab (color toned image; shallow DOF)
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Young teacher and her pupils doing tests at chemistry lesson
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Pretty, young college student wiping the chalkboard/blackboard between classes (shallow DOF; color toned image)
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Senior doctor using his tablet computer at work (color toned image)
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Senior chemistry professor/doctor in a lab (color toned image)
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Pretty young college student or teacher washing the chalkboard/blackboa rd during class (shallow DOF; color toned image)
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Senior chemistry professor giving a lecture in front of classroom full of students (shallow DOF; color toned image)
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Senior chemistry professor giving a lecture in front of classroom full of students (shallow DOF; color toned image)
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senior male researcher carrying out scientific research in a lab using a microscope (shallow DOF; color toned image)
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Senior chemistry professor writing on the board while having a chalk and blackboard lecture (shallow DOF; color toned image)
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science and chemistry classees at school with smart children and teacher
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Young man in casual with book in hands
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Young man in casual with book in hands
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happy children group in school classrom taking notes and learning biology and anatomy lessons with teacher
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Senior male researcher carrying out scientific research in a lab (shallow DOF; color toned image)
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Senior male researcher carrying out scientific research in a lab (shallow DOF; color toned image)
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Senior male researcher carrying out scientific research in a lab (shallow DOF; color toned image)
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Portrait of a female researcher doing research in a lab (shallow DOF; color toned image)
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Math teacher by the blackboard during mathclass - detail of the hand with chalk
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Math teacher by the blackboard during mathclass - detail of the hand with chalk
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Pretty young elementary school/college teacher writing on the chalkboard/blackboard during a chemistry class (color toned image; shallow DOF) class (color toned image; shallow DOF)
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Senior researcher using a computer in the lab while working on an experiment (color toned image)
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senior male researcher carrying out scientific research in a lab using a gas chromatograph (shallow DOF; color toned image)
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Renowned scientist/doctor standing on the roof of the research center/hospital looking confident (color toned image)
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Pretty young college student or teacher washing the chalkboard/blackboa rd during class (shallow DOF; color toned image)
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Senior male researcher carrying out scientific research in a lab (shallow DOF; color toned image)
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Senior male researcher carrying out scientific research in a lab (shallow DOF; color toned image)
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Portrait of a female chemistry student carrying out research in a chemistry lab (color toned image; shallow DOF)
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Senior male researcher carrying out scientific research in a lab (shallow DOF; color toned image)
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Senior male researcher carrying out scientific research in a lab (shallow DOF; color toned image)
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Senior chemistry professor giving a lecture in front of classroom full of students (shallow DOF; color toned image)
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portrait of a female researcher doing research in lab using microscope (color toned image; shallow DOF)
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Senior chemistry professor giving a lecture in front of classroom full of students (shallow DOF; color toned image)
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Pretty young elementary school/college teacher writing on the chalkboard/blackboard during a chemistry class (color toned image; shallow DOF) class (color toned image; shallow DOF)
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Senior doctor using his tablet computer at work (color toned image)
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Team of researchers carrying out experiments in a lab (shallow DOF; color toned image)
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