ID 139550506 © Elnur | Megapixl.com
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.:
academic algebra blackboard board book books chalk chalkboard class classroom college drawing education equation exam excited experiment formula formulas happy high learn learning lesson man math mathematical mathematician mathematics physicist physics pupil research school science scientific scientist smart solution student study studying teacher teaching test textbooks thumb thumbs university