There are thousands of farmers in the United States who claim the most popular pesticide on the planet is giving them cancer. Commonly known as RoudUp, the chemical glyphosate was developed by Monsanto in the 1970's, to be used on genetically modified crops. Monsanto, which makes 7 billion dollars from glyphosate, says its product is safe. This story examines the human consequences, and disputed science, behind one of the world's most common chemicals. Originally broadcast November 2, 2017.