What in the world are Planarian Flatworms? Why in the world did scientists send them on a mission to outer space? And where in the world are their mouths if not on their heads?! Join Guy Raz and Mindy Thomas for a tale of two worms....in one body. It's the latest who, what, when, where, why, how, and WOW in the world of WORMSTRONAUTS! Originally aired August 24th, 2017.See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.