A Biology professor from the University of California Berkley gave a presentation warning of the risks of a chemical used on Missouri’s corn. Tyrone Hayes says atrazine, a chemical made popular by its effectiveness in killing weeds but not corn, could be harmful to people, because it increases estrogen production in those who ingest it.

He says he knows farmers depend on this to grow enough corn to meet demand, so there’s not an easy solution.

Hayes is touring different Universities in areas that use a lot of atrazine. He says his research has primarily been on its effects on frogs, which are actually changing their gender because of the exposure.

AUDIO: Allison Blood reports 1:03