Gogolplex | CC BY-SA 3.0 / Wikimedia Commons
Source: https://commons.wikimedia.org/wiki/File:Tr-G%C3%B6k_Bo%C4%9Fas%C4%B1-article.oga
License: https://creativecommons.org/licenses/by-sa/3.0
Changes: excerpted audio, re-encoded, captions and original motion graphics added. No synthetic voice or added soundtrack.

Video license: CC-BY-SA-3.0 https://creativecommons.org/licenses/by-sa/3.0
Artist / recording page: https://commons.wikimedia.org/wiki/File:Tr-G%C3%B6k_Bo%C4%9Fas%C4%B1-article.oga
Motion graphics and edit: AI Free Audio to Video.