С для чего/кого линза на якутском ноже?...

I believe it's clear to everyone where this or that part of the information presented was taken from, and from which channels. In addition to the video, there are stills from the film "The Evil Spirit of Yambuya," filmed in 1977. Furthermore, images were taken from publicly available resources accessible through search engines. Watch, listen, and draw your own conclusions. Happy New Year to everyone! P.S. And this is the patent for the invention of that very Yakut knife. https://yandex.ru/patents/doc/RU26350... I express my gratitude for the link provided in the "Showcase" group.