A University of California chemistry professor, Tyrone Hayes, discovered that atrazine, a pesticide made by Syngenta and sprayed on much of the country's corn crops, as well as on golf courses, has feminizing effects on amphibians.  Among these effects are males growing ovaries and laying eggs, and males mating with other males.  Hayes talks about the retaliation he experienced, including direct and sinister threats of harm to him and his family, once his research was published.