A listener writes in with a bizarre story of experiments with blood substitutes in the US and Brazil. The DuPont family is rumored to own a mysterious structure near a place called Devil's Road. Colorado courts controversy with new facial recognition requirements. All this and more in this week's listener mail.

Learn more about your ad-choices at https://www.iheartpodcastnetwork.com

They don't want you to read our book.: https://static.macmillan.com/static/fib/stuff-you-should-read/

See omnystudio.com/listener for privacy information.