Researcher Alexandr Chermnykh is studying propertys of light.
<a href="//commons.wikimedia.org/w/index.php?title=User:Yakushev.dim&amp;action=edit&amp;redlink=1" class="new" title="User:Yakushev.dim (page does not exist)">Yakushev.dim</a>
CC BY 4.0
<span class="int-own-work" lang="en">Own work</span>