Day,Standing,Working,Casual Clothing,45-50 Years,Middle-Aged,Group Of People,Young Adult,Indoors,Concentration,Background People,people,Sitting,Adult,Woman,Female,Man,Male,20-25 Years,Assistance,Helping,Teaching,Bending Down,Education,Lesson,young man,Classroom,Student,Class,Textbook,Teacher,Lecturer,young woman,mixed race,university student,lecture theatre –