Louis Pasteur was a Frenchman who lived in the 1800's. Pasteurization grew out of his dramatic discovery that tiny living things cause foods like milk to spoil. He also proved that some microscopic living organisms are helpful to human beings, while others cause illness. His discovery that germs can cause disease is the foundation of modern medicine. Read about these and other discoveries made by Louis Pasteur in this biography written by author John Hudson Tiner. 182 pages, paperback, 5 1/2"x8 1/2".