optimistic

Laughing old professor with his eyeglasses on his head
Laughing mature professor standing with his hands folded and eyeglasses off
Mature professor laughing hard about something
Serious looking old professor holding small blackboard
Mature professor with eyeglasses off and hands folded giggling
Laughing old professor holding small blackboard
Thinking about all these work things
Excited mature professor adjusting eyeglasses
When science work's been just great
Serious looking old professor with eyeglasses on head and hands folded
Laughing old professor holding a small blackboard
Here the list ends
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