45-50 Years,Middle-Aged,Middle-Aged Man,Small Group Of People,Indoors,Hispanics,Half-Length,people,Boy,School,Men,Males,Adults,40s Adult,Girls,Females,Youth,Clothing,African Americans,Boys,Blacks,Americans,Few,Teenager,Teenage Boy,Man,Young,Discovery,human being,human,Learning,Pouring,Container,Teaching,half length,middle-aged men,guys,guy,mature men,mature man,middle-age,middle aged,middle age,mature,late forties,late 40s,fortysomething,forties,Photography,16-17 Years,Teenage Girl,High School,teenage,Education,Instructor,Teen,several,wearing,garment,clothes,apparel,Instructing,Study,Student,High School Student,Teacher,Studying,Research,Outerwear,ethnic,african american ethnicity,black American,African-American,inside,African American,Laboratory,Research Facility,Experiment,Experimentation,Experimenting,laboratories,research facilities,labs,lab,researching,Laboratory Coat,Lab Coat,Natural Sciences,educating,educate,learn,educational,highschool student,academic,teenaged,adolescent,studious,Sciences,Instruction,Chemistry,discoveries,discover,discovering,Hispanic ethnicity,Latin,Latino,educator,chemical,beaker,upper body,gent,teach,instruct,pour,Periodic table,elements,chemical element,45 to 50 year olds,45 to 50 years old,middle aged man,Teenage Girls,Teenage Boys,african-americans,middle aged men,age 45-50 years,16 to 17 years old,teenaged boy,teenaged boys,teenaged girl,teenaged girls,16 to 17 year olds,age 16-17 years,secondary school –