chemistry teacher smiles looking into the room school blackboard with formulas background |
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| navigate by keyword : 60s acid alone background blackboard board book chalk chemistry class classroom college contact development education expertise explaining eye face formula formulas good instructor lab lecture looking mid molecular molecule mood people portrait room school science seminar serious sixties smart smile smiles smiling speaker standing structure student study suit supply teacher teaching tumb university woman |
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| Chemistry teacher smiles looking into the room at school. School blackboard with formulas on the background. |
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