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That was the headline on the News Scientist news feed. And the article is just what it says:
http://www.newscientist.com/article/dn23230-mars-trip-to-use-astronaut-poo-as-radiation-shield.html
http://www.newscientist.com/article/dn23230-mars-trip-to-use-astronaut-poo-as-radiation-shield.html