Keywords
30 to 34 years, 40 to 49 years, 45 to 49 years, adult, adult education, blur, book, caucasian, class, classroom, college, day, differential focus, diversity, document, educate, educating, education, ethnic, facial expression, female, five people, focus, focus techniques, group, group of people, handing, head and shoulders, headshot, indoors, learning, lecture, looking, looking away, male, man, mature adult, mature student, mature woman, mid adult, mid adult man, mix, mixed, mixed race, multi ethnic, multi-ethnic, multi-ethnic group, public services, receiving, school, sitting, small group of people, smiling, social institution, student, university, white, woman, stock image, images, royalty free photo, stock photos, stock photograph, stock photographs, picture, pictures, graphic, graphics, fine art prints, print, poster, posters, mural, wall murals, is099qt0r