This month marks the 50th anniversary of Rachel Carson's "Silent Spring." The book changed the way we think about pollution and human health and led to the creation of the EPA and to a ban on DDT. What would the Pennsylvania native have to say about hydrofracking? WPSU's Patty Satalia poses that question to biologist, best-selling author and cancer survivor, Sandra Steingraber, who is sometimes referred to as the "new Rachel Carson."