20s
adult
african
american
apple
classroom
communication
concept
connection
desk
digital
ebook
education
elearning
ereader
female
finger
formula
fruit
guy
holding
index
information
internet
knowledge
library
mathematics
occupation
one
online
person
pointing
problem
professional
professor
school
screen
student
surfing
tablet
teacher
technology
touchpad
touchscreen
university
wireless
woman
working
young