What Do All the Billionaires Know That Has Them Prepping for Doomsday?

It’s not every day that construction workers are required to sign NDAs. Of course, it’s also not every day they work on $270 million doomsday bunker for none other than Facebook founder Mark Zuckerberg, either.

 But every worker on the project on the remote Hawaiian island has been asked to sign a non-disclosure agreement and swear secrecy. As reported by Wired: 

 “That price for a private residence is unparalleled in the local construction industry—as is the level of secrecy and security. ‘The ...