Caucasian old male teacher in glasses standing in library and holding tablet device. Portrait of senior wise man watching something on tablet computer and then smiling to camera in bibliotheca.
Thoughtful senior caucasian woman in living room sitting on sofa, thinking
Young Latin woman scientist ponders problem at library
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Thoughtful Senior Woman Thinking Portrait Face Closeup Older Person Thinking
Thoughtful Woman Thinking on a Solution on Yellow
Thoughtful politician sitting at a desk and thinking