PewDiePie mentioned Our Mathematical Universe by Max Tegmark 3 times

This book brought up so many scientific possibilities that I had obviously no clue about they were never taught to me in school and to me they're just mind-blowing. I really don't want to sound like that one ninja tweet I can't stop thinking about Quantum fixes or whatever it is.

— PewDiePie

On Felix's bookshelf.

Next up I read our mathematical universe by Max Tegmark. I love this book it's so good, it's really good. This book is basically everything in physics that is cool. That's where I learned about the doomsday theory. I never heard about that before and I just thought whoa that's so interesting.

— PewDiePie