ID 245496531 © Andron1982198221 | 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.:
adult background blackboard board calculate chalk chalkboard chemical chemist chemistry class college complex concept diagram drawing engineering equation formula hand job knowledge laboratory learn lecture male man molecule person professional research school science scientific scientist scribble sign smart solution structure student study studying teach teacher technology university whiteboard write 4k