I'm watching BookTV on C-Span2 right now, and watching author Devra Davis discuss her book "Secrets of the War on Cancer." The premise is that there are many, many environmental and chemical cancer causing substances out there that are known, but not being managed or appropriately communicated largely due to politics. Its pretty sad and quite eye opening. I think her book is a must read. You can hear the author interviewed on NPR if you'd like to learn more.