Murky Waters and Pi Day Published March 14, 2014 at 2:15 PM CDT Listen • 46:22 Ben Kieffer / Iowa Public RadioThough Iowa’s rivers and streams may look particularly scummy or murky, the DNR says the state’s waterways are perfectly fine. The murky appearance is caused by organic matter and is safe.";s: Is winter almost over? And how has the long, harsh season affect Iowa's waterways and aquatic life? Also, the latest Quinnipiac poll, 2014's Cancer in Iowa report, Iowa's new tourism ad campaign and Pi Day at the Science Center of Iowa.