Waste Not, Wilt Not

A significant addition to the list of requirements for the couple looking for a trip to Mars (see "Who Wants To Go to Mars?," Feb. 27, 2013) ~ they must be willing to go to some rather unceremonious lengths to protect themselves from radiation: http://www.newscientist.com/article/dn23230-mars-trip-to-use-astronaut-poo-as-radiation-shield.html