Bubble Universes https://xkcd.com/2688/ https://m.xkcd.com/2688/ pic.twitter.com/zhMuNzhl57
π§ https://www.frederickcalica.com/?p=3338354
Bubble Universes https://xkcd.com/2688/ https://m.xkcd.com/2688/ pic.twitter.com/zhMuNzhl57