A little over a century ago, buying a cup of coffee might mean sipping on additives like charcoal and charred bone. Adding milk? It might have one of that era's main preservatives ... formaldehyde. Dr. Harvey Washington Wiley and his fight for pure food is the subject of Deborah Blum's new book, "The Poison Squad".His crusade means our food today is safe ... right? Want to support 1A? Give to your local public radio station and subscribe to our podcast. Have questions? Find us on Twitter @1a.