Harvey Wiley's Fight for Pure Food

Dr. Harvey Wiley spent most of his professional life advocating for pure food—food free of both adulterants and preservatives. At the Department of Agriculture, he conducted the "Poison Squad experiments" to learn about the effects of various chemicals on the human body. His work continues to influence our opinions and fears about food today. Guest: Jonathan Rees, author of "The Chemistry of Fear: Harvey Wiley's Fight for Pure Food"