Keywords
13 to 15 years, 35 to 39 years, accuracy, adolescent, adult, blond, blur, book, brunette, caucasian ethnicity, class, classroom, close, close-up, color, communicating, communication, companion, dark hair, day, demonstration, desk, detail, differential focus, document, educate, educating, education, fair, female, flask, focus, focus techniques, four people, friendship, furnishing, group, group of people, guardian, hair, hair color, hairstyle, head and shoulders, headshot, health-and-safety, intelligence, interaction, juvenile, lab coat, laboratory beakers, learning, lesson, long hair, mid adult, mid adult woman, networking, physics, projection equipment, projection screen, protection, protective clothing, puberty, pupil, saying, school, science, screen, showing, sitting, small group of people, smart, stand, standing, stands, talking, teacher, teenage girl, teenager, textbook, view, view point, volumetric flask, white, woman, youngster, youths, 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, is09a862c