Senior chemistry professor writing on the board while having a chalk and blackboard lecture (shallow DOF; color toned image)
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Young funny man in glasses against chalk blackboard
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Middle aged confident businessman hands on waist
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Little cute girl sitting on pile of books and pointing with finger
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Young smiling businessman acting like super hero and tearing his shirt off
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Portrait of a pretty young college student writing on the blackboard during a maths class (color toned image)
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Pretty, young college student writing on the chalkboard/blackboard during a math class (colort toned image; shallow DOF)
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Pretty, young college student writing on the chalkboard/blackboard during a math class (colort toned image; shallow DOF)
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Blackboard/chalkboard during math class in front of the(color toned image)
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Young woman holding up a molecular model of nicotin
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Blackboard with math lesson written on it
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Medicine worker in white wear and with monitor instead of head
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Cute dog in glasses reading book. Mixed media
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Math teacher drawing   fuction graph on a blackboard during mathclass (shallow DOF, color toned image)
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Young caucasian kid girl playing game of chess
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School girl at blackboard pointing at science formula with finger
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Math teacher drawing   fuction graph on a blackboard during mathclass (motion blurred image)
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Handsome college student solving a math problem during math class in front of the blackboard/chalkboard (color toned image)
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Handsome college student solving a math problem during math class in front of the blackboard/chalkboard (color toned image)
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Students in a classroom - handsome student solving a math problem on a blackboard during math class
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Students in a classroom - handsome student solving a math problem on a blackboard during math class
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Students in a classroom - handsome student solving a math problem on a blackboard during math class
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Math teacher drawing   fuction graph on a blackboard during mathclass (motion blurred image)
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Businesswoman hiding her face behind paper mask
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the student uses a book trying to make a math problem on the board
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a portrait of a determined student in front of a school board
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Female university student in front of a blackboard solving a problem - Young teacher in classroom drawing a planimetry problem on the blackboard
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Math teacher drawing   fuction graph on a blackboard during mathclass (motion blurred image)
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Students in a classroom - handsome student solving a math problem on a blackboard during math class
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