Sponsored videos by

Vertical HD video of senior adult woman teaching at college or school. Female teacher giving a lecture to her students in the classroom. High school and secondary education
Caucasian tired woman take off glasses female overworked student stress school worker library health problem headache migraine head eyes strain businesswoman indoor business girl sad painful teacher
A young female researcher focuses on her research, studying samples and analyzing data to find new solutions in medicine. The laboratory is a place where new vaccines are developed and tested to
chemical analysis of agricultural crops, professional male laboratory technician in protective clothing conducts soil tests and drops chemical composition from a pipette onto a plant in a modern
Man, lecturer and explain in classroom for lesson, college lecture and teaching students. Male professor, talking and learners listen for learning schedule, curriculum procedure and exam instructions

Free stock videosstudy (65)