Kurzgesagt - In a Nutshell - Season 11 Episode 12 We Did The Math - You Are Dead!
8.6010 minutes
Absolutely everything you think about yourself and the universe could be an illusion. As far as you know, you are real and exist in a universe that was born 14 billion years ago and that gave rise to galaxies, stars, the Earth, and finally you. Except, maybe not.