Dr. Tyrone Hayes, an assistant professor of integrative biology at the University of California, Berkeley, will present "From Silent Spring to Silent Night: A Tale of Toads and Men." He will discuss the harmful impacts of chemical contaminants on amphibians and humans in Bowling Green State University's 2015 Jean Pasakarnis-Buchanan Lecture Tuesday 7 p.m. in 112 Life Sciences Building on campus.