Keywords
2, 20's, 20-24 years, 20-25, 20-30, 20s, 25-30, adult, answer, atom, blackboard, calculation, caucasian, chalkboard, chemistry, chin on hand, class, classmate, classroom, college, color, color image, colour, complexity, computation, concentrating, concentration, considering, contemplation, dedication, determination, education, equation, examining, eyeing, fellow, female, focus on foreground, formula, fortitude, furnishing, furniture, gal, gentleman, guy, head & shoulders, head and shoulders, head in hands, horizontal, human, human being, indoor, indoors, information, inside, instructing, instruction, intelligence, knowledge, lady, learning, looking, looking down, male, man, mathematics, model, molecular model, molecule, particle, people, persistence, person, photography, pondering, pupil, resolution, result, school, schoolmate, schoolroom, science, seated, seeing, serious, seriousness, sitting, solemn, solution, somber, standing, student, studying, table, teaching, thinker, thinking, three quarter length, three-quarter length, tuition, tutoring, twenties, twenty, two, two people, university, viewing, western european, wisdom, woman, women, writing, young adult, young men, young women, 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, blm016368