20s
academic
adult
african
american
analyzing
atoms
biochemistry
boy
caucasian
chemistry
classmate
classroom
concentration
desk
education
examining
female
girl
group
high
holding
indoor
intelligence
knowledge
lab
labcoat
looking
male
microbiology
model
molecular
molecule
multiethnic
occupation
people
research
school
schoolchildren
science
smile
structure
student
study
teacher
teenager
university
woman
women
young