Keywords
55-60, 55-60 years, adult, alertness, away, background, blue, caucasian, caucasian ethnicity, classroom, decisions, education, equipment, ethnicity, focus, focus on background, front, front view, gray, gray hair, hair, hand, hand raised, high, high school student, indoors, instruction, instructor, intelligence, learn, learning, look, looking, looking away, mature, mature adult, mature men, men, people, person, ponytail, presentation, projection, projection equipment, projection screen, purestock, raised, school, screen, shirt, shirt and tie, student, teach, teacher, teaching, tie, two, two people, unrecognizable, unrecognizable person, view, waist-up, years, 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, 1574r-015097, 1574r 015097, 1574r015097