Middle age man with grey hair working at scientist laboratory pointing thumb up to the side smiling happy with open mouth

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Middle age man with grey hair working at scientist laboratory pointing thumb up to the side smiling happy with open mouth

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happy laboratory man mouth pointing scientist side smiling thumb adult beard cheerful chemistry clinic confident emotion experiment expression face finger friendly gesture gesturing grey hair hand hispanic idea joy lab long hair looking male mature microscope middle age open mouth optimistic point positive professional research science senior showing showing smile thumbs up trust
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