Hayes, an expert in the endocrinology of amphibians, was tapped by Syngenta to conduct experiments on the herbicide atrazine. His studies suggested that atrazine could impair the frogs' sexual development. In 2000, Hayes severed his relationship with Syngenta, and that's when things got interesting.
Even some of the scientist's former students grew skeptical when he described a campaign by the company to discredit him. But as reporter Rachel Aviv writes: