http://www.washingtonpost.com/blogs/innovations/post/a-bacteria-that-poops-gold-yep-that-exists-and-its-in-an-art-exhibit-video/2012/10/04/1617f178-0e5d-11e2-bd1a-b868e65d57eb_blog.html
http://goo.gl/qVL9J Vid caption: "This microbial magician, named Cupriavidus metallidurans, when placed in a minilab full of gold chloride, a nasty toxin, gobbled up the poison and, in about a week, processed it out as 24-karat nuggets of the precious yellow metal."
