Keywords
16 to 17 year olds, 16 to 17 years old, 16-17 years, 30's, 30s adult, 35 to 40 year olds, 35 to 40 years old, 35-40 years, 40 to 45 year olds, 40 to 45 years old, 40-45 years, 40s adult, academic, adolescent, adults, african american, african american ethnicity, african americans, african-american, african-americans, age 16-17 years, age 35-40 years, age 40-45 years, americans, black american, blacks, boy, boys, caucasian, chemical element, chemistry, early 40s, early forties, educate, educating, education, educational, educator, elements, ethnic, females, few, forties, fortysomething, gent, gesture, gesturing, girls, guy, guys, hand raised, hand raising, hand up, hands in air, hands in the air, hands lifted, hands lifted up, hands raised, hands up, high school, high school student, highschool student, hispanic ethnicity, hispanics, human, human being, indoors, inside, instruct, instructing, instruction, instructor, late 30s, late thirties, latin, latino, learn, learning, lift hands, lifted hands, lifting hands, males, man, men, mid-adult, mid-adult man, natural sciences, people, periodic table, photography, raise hand, raise your hand, raised hand, raising hand, school, sciences, secondary school, several, small group of people, student, teach, teacher, teaching, teen, teenage, teenage boy, teenage boys, teenage girl, teenage girls, teenaged, teenaged boy, teenaged boys, teenaged girl, teenaged girls, teenager, thirties, thirtysomething, whites, young, youth, 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, u14477205