senior teacher teaching chemistry |
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| navigate by keyword : 60s active adult age aged alone american board boomer boomers bright camera casual caucasian chemistry class classroom coat contact copyspace day drawing education elderly elementary european eye face female formula good gray hair healthy holding horizontal image indoor indoors lab lecture lecturer lifestyle looking mature molecular molecule mood old older one only people person photo portrait room satisfied school science senior single sixties smile smiling smock standing stockphoto structure teacher teaching uniform white whiteboard woman work working |
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| Senior teaching chemistry in school, drawing molecular formulas on whiteboard. |
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