Ключевые слова: 1, 30s, 30s adult, 3540 years, 4045 years, 40s adult, adults, alone, back view, backview, behind, caucasian, class, classroom, complex, complexity, complicated, concentrate, concentrated, concentrating, concentration, dry erase board, early 40s, early forties, educate, educating, education, educational, educator, elaborate, focus, forties, fortysomething, from behind, guy, guys, half length, halflength, human, human being, individual, indoors, inside, instruct, instructing, instruction, instructor, intricacy, intricate, late 30s, late thirties, learn, learning, males, man, math, mathematician, mathematics, men, midadult, midadult man, one, one person, one person only, people, person, photography, rear, rear view, room, schoolroom, science, scientific, teach, teacher, teaching, text, thirties, thirtysomething, view from behind, white board, whiteboard, whites, wipeaway board, words, write, writing, written,