1314 years
1415 years
3035
30s
3540
40s
academic
american
board
boy
caucasian
class
classroom
computer
computer science
course
education
european
explain
female
french
german
girl
high school
indoor
information
instructor
intelligent
job
knowledge
learning
lecture
lesson
marker
person
presentation
school
science
student
study
teacher
teenager
tutor
whiteboard
woman
young