Senior caucasian man working at scientist laboratory with hand on chin thinking about question, pensive expression. smiling and thoughtful face. doubt concept.

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Senior caucasian man working at scientist laboratory with hand on chin thinking about question, pensive expression. smiling and thoughtful face. doubt concept.

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caucasian chin doubt expression face hand laboratory man pensive question scientist senior smiling thinking thoughtful adult cheerful chemistry clinic clueless confused deliberate elder experiment friendly grey hair guess happiness happy idea imagine indoors lab looking male mature microscope people person portrait professional research science smart smile solution think thoughts up wonder
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