How is a tadpole like a short-sleeved white tee shirt? The answer lies in the Alameda Creek outside San Francisco, California, USA. Ari Daniel Shapiro wades into the issue of dams and biodiversity with two biologists sampling the DNA of this threatened frog in order to save it. Photo Credit: Alessandro Catenazzi, CC BY-NC-SA Download a transcript of this podcastread moreDuration: 5:12Published: Wed, 05 Sep 2012 16:24:17 +0000