Geek's Guide to the GalaxyCultureDec 11, 2020 12:00 PMThe Hollow Earth Theory Isn't So Funny AnymoreOwen Egerton's 2017 book Hollow used the theory to tell its story. Now that conspiracies are everywhere, he's reconsidering that move. Illustration: Chronicle/Alamy Stock PhotoSave this storySaveSave this storySaveTK