When Arthur Galston discovered a chemical compound that could make soybeans flower early, he didn't suspect that the chemical would be used by the U.S. Army to create Agent Orange, the toxic defoliant employed in the Vietnam War. Galston lobbied then Presidents Johnson and Nixon to halt the use of the dangerous substance, and spoke out on bioethics and the risks of scientific research. Living on Earth honors Arthur Galston who died recently at age 88.