Young Asian student posing and smiling by chalkboard
Blonde student teaching math lesson in classroom
Young student smiling by chalkboard in high school classroom
Young male student posing with smile in classroom
Young student smiling at camera in college classroom
African American professor standing at lectern in front of chalkboard and explaining math to university students
African American lecturer standing at lectern in front of chalkboard and explaining algebra to university students
Young woman confidently speaking at lectern in university classroom
Senior professor in formal suit and glasses drawing graph on chalkboard in classroom, then turning to camera and posing with hand on wooden lectern
Cheerful senior male farmer in apron and tool belt standing beside wooden wall in greenhouse, posing for camera and smiling
Biracial male student standing at lectern, pointing at math formulas on chalkboard, reading papers and speaking to group mates during lesson
Cartoon animation with the female class teacher,standing next to the chalkboard. Funny cartoon animation with the female class teacher, standing next to the chalkboard with the long wooden pointer. She is transferring knowledge to the students