20-25 20-30 25-30 40-45 40-50 45-50 5 50-55 50-60 55-60 adult african african american african-american afro american afro-american americas answer argentinean attentiveness black black heritage brazilian central america child children class college color colour concentrating considerate counseling demonstrating educating educator examining exhibiting experimentation fellow female fifties fifty five forties forty furnishing furniture gal gentleman guy hearing high-school highschool hispanic human human being indoor information inside instructing instruction intelligence juvenile kid lab lad lady latin american lecturer listener male mexican mid life middle age middle aged middle-age middle-aged minor mode observing of african descent person pupil research researching result schooling schoolmate schoolroom seat seating seminar session side-view solicitous south america south american spectating spectator speech system talking technique teen teenage thoughtful toiling training tuition twenties twenty viewing waist-up western european wisdom women work youngster youthful adolescents attend attends attended attending benches boys boy's caucasians chemical chemicals classmates classrooms colored colors concentrate concentrating concentrates concentrated demonstrations desks display displays displayed educate educates educated educating experiment experiments experimented experimental front views girls girl's groups schools hold holds held knowledgeable laboratories latins learn learns learned learnt lecture lectures lectured lessons listen listens listened men man's men's maturity methods mixed race people occupations photographic professors profiles schools sciences scientific scientifically scientists showed side views solutions stood students study studies studied teachers teach teaches taught teenagers together tutorials tutor tutors tutored universities vertically verticals watch watches watched women's woman's work works worked young adults youths african american
