Mature man physicist writing formulas on blackboard with chalk indoors

Mature man physicist writing formulas on blackboard with chalk indoors at school busy with solving scientific problem. Science, occupation and education concept. You can download this footage(4K, 1080p) and watch our potfolio at: https://www.shutterstock.com/g/silver... https://www.pond5.com/artist/silverkb... https://stock.adobe.com/ru/contributo... For direct licensing please contact us p.m. Out team create stock video footages for your projects - mass media, advertising, web site, films, presentations, blog, design etc .