http://cdn.conversationsnetwork.org/ITC.TN-CarlZimmer-2008.07.07.mp3 Carl Zimmer - On Ecoli http://feeds.conversationsnetwork.org/~r/channel/itc/~3/332193079/detail3733.html 2008-07-09 http://assets.conversationsnetwork.org/channels/ITConversations/itc-300x300.jpg