ID 27107991 © Paha_l | Megapixl.com
Model Released
Sharing is not just caring, it's also about giving credit - add this image to your page and give credit to the talented photographer who captured it.:
auditorium axis back blackboard business calculus chalk class classroom compute course education equation exercise face fail forget formula frustrated head inp lecture lecturer math mathematics meditate physics practice problem professor proof research room russia samara scholar school schooling science scientist seminar solve teacher technical test think university write