* Coordinator, Toxic Substances Hydrology Program, U.S. Geological Survey, Trenton, New Jersey
* Senior Scientist, Environmental Defense, New York, New York
* Former Assistant Administrator, Office of Prevention, Pesticides, and Toxic Substances (1993 to 1998), Environmental Protection Agency
* Pediatrician and Professor, Environmental Health Sciences, Johns Hopkins University, Baltimore, Maryland
* Professor and Chair, Department of Neuroscience, Brown University, Providence, Rhode Island
Last week, the U.S. Geological Survey said its survey of 139 streams in thirty states detected dozens of drugs, hormones, and household chemicals in the waterways.
This hour, we'll talk about what the U.S.G.S. found, and what scientists know—or don't know—about how these chemicals affect the environment and human health.
Plus, a new study with monkeys that—if the results hold true for humans—may one day let paralyzed patients control computers and robots with their thoughts.