Confused male teacher or scientist shrugging his shoulders looking at the camera in a classroom or labratory
Portrait of scientist man with mathematical equations background. He put on his glasses and smile at camera. Clever and smart teacher lecturer concept. Let's study!
Confused red-haired student solving math problem at college. Achievement and difficulties concept.
Scientist working with microscope and thinking about the following steps to improve the results of research
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Puzzled woman doctor or nurse thinking over blue background over blue background
Scientist writing formulas on chalkboard. Hand with chalk wrote physics formulas on black chalkboard closeup
Indecisive female student working on a hard math problem erasing and rewriting solutions with her male teacher in a classroom
Two confused college students look directly at the camera as if talking to their teacher looking for guidance, advice, or assistance
