ASA Lecture Audio: "The Chemicals Pour Forth Speech"

Here is a link to the audio of the presentation I did in Washington DC about a month ago at the ASA (American Scientific Affiliation) meeting: "The Chemicals Pour Forth Speech: Teaching Origins with a Biogeochemical Narrative." (I've really got to make some shorter titles ... ) The actual talk starts at the 3-minute mark. Let me know what you think!