academic
biologist
biology
blackboard
board
books
boy
chalkboard
chemical
chemist
chemistry
class
classroom
college
discussing
education
exam
examination
explaining
green
high
knowledge
learn
learning
lecture
lecturer
lesson
man
model
molecular
molecule
physicist
physics
pointing
preparing
research
researcher
school
science
scientific
scientist
showing
student
study
studying
teacher
teaching
tubing
university
young