Grey hair professor pointing on something at blackboard with wooden pointer — Stock photos

"Grey hair professor pointing on something at blackboard with wooden pointer" is a stock image by IgorVetushko. It’s available in the following resolutions: 667 x 1000px, 1335 x 2000px, 4095 x 6136px. The minimum price for an image is 2.99$. Image in the highest quality is 4095 x 6136px, 300 dpi, and costs 9.99$.