Un hombre barbudo se sienta en un escritorio, dedicado al pensamiento, posiblemente preparando una lección o investigando. - Foto e imagen de stock

Open to new knowledges. Elderly gray-headed man, professor, teacher and students at lecture, lesson at classroom, indoors. Concept of professional occupation, job, education. Back to school

Young students talking in a classroom during break

Open to new knowledges. Elderly gray-headed man, professor, teacher and students at lecture, lesson at classroom, indoors. Concept of professional occupation, job, education. Back to school

Smiling teacher pointing with finger near schoolboys and gadgets in classroom

Smiling teacher pointing with finger near schoolboys and gadgets in classroom

Cheerful teacher waving hand at pupils on blurred foreground in classroom

Smiling businessman in eyeglasses looking at blurred job seeker in office

Selective focus of young businessman talking at business meeting

Happy teacher using laptop near blurred child in classroom

Positive african american teacher pointing with hand near blurred pupils

Bearded businessman typing on laptop near multiracial woman on blurred foreground

Businessman talking and gesturing near new worker with laptop in office