20s
adult
attention
book
boy
caucasian
child
classroom
communication
concentrating
conversation
desk
education
elementary school
explaining
guidance
helping
horizontal
incidental people
indoors
kid
knowledge
learning
lesson
listening
looking at each other
man
medium group of people
mentoring
millennials
multiethnic group
part of person
preteen
pupils
school
schoolboys
schoolchildren
schoolgirls
selective focus
sitting
students
talking
teacher
teaching
two people
waist up
whiteboard
young adult