Middle age Brazilian scientific man scientific isolated on white background happy and smiling covering mouth with hand

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• person smiling
• portrait
• face
• test tube
• flask
• face portrait
• person
• male
• laugh
• lab test
• chemistry lab
• lab
• positive
• smiling
• chemical
• adult
• confidence
• chemistry
• scientist
• pose
• scientific
• age
• mouth
• medical test
• pharmacy
• expression
• pharmacology
• life
• hand
• brazilian
• glassware
• fun
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