Questions on biodiversity, endangered habitats, and how best to preserve the Earth's ecosystems, are answered by Dr. E.O. Wilson of the Department of Organismic and Evolutionary Biology at Harvard University, Dr. Eric Chivian of the Center for Health and the Global Environment at Harvard Medical School, Dr. Bassler and Dr. Olivera. Drs. Wilson and Chivian deliver short presentations on biodiversity to start the session. The question and answer session is moderated by HHMI President Dr. Robert Tjian.