Tyrone Hayes
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"Tyrone B. Hayes" is an American biologist and professor of Integrative Biology at University of California, Berkeley known for his research findings concluding that the herbicide atrazine is an endocrine disruptor that demasculinizes and feminizes male frogs. He is also an advocate for critical review and regulation of pesticides and other chemicals that may cause adverse health effects. He has presented hundreds of papers, talks, and seminars on his conclusions that environmental chemical contaminants have played a role in global amphibian declines and in the health disparities that occur in minority and low income populations. His work has been contested by Syngenta, the Swiss manufacturer of atrazine, the United States Environmental Agency and the Australian Pesticides and Veterinary Medicines Authority. It was used as the basis for the settlement of a multi-million dollar class-action lawsuit against Syngenta.

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We demonstrated that a realistic pesticides mixture (based on a mixture applied to an actual field) at low, ecologically relevant concentrations can have dramatic effects on amphibian development and growth and ultimately, we predict, survivorship.

Obviously this is not normal.

In humans, this is like saying, 'The longer you are pregnant, the smaller your baby will be,' which means the womb is no longer a nurturing environment.

Our impact is measured in an insignificant way. I now measure my impact differently.