Source: Image of light, Public Domain, http://tinyurl.com/p4pfjr7 ; Image of bubble, Public Domain, http://tinyurl.com/laefzcc ; Image for Learning, Public Domain, http://tinyurl.com/kf3rkwh ; Image of question marks, Public Domain, http://pixabay.com/en/question-mark-question-mark-423604/; Image of teachers/students, Public Domain, http://pixabay.com/en/teacher-mentor-coach-tutor-407360/; Image of computers, Public Domain, http://pixabay.com/en/tablet-screen-monitor-phone-pc-313002/ ; Image of desk, Public Domain, http://tinyurl.com/n84gd8u
