University of Massachusetts at Amherst Distinguished Professor Lynn Margulis, one of the most renowned biologists in the world, will give a public lecture at the University of Colorado at ºù«ÍÞÊÓƵ on March 15. Her talk, titled "Gaia and Microcosm: Living Earth From Space," deals with the Gaia theory, which she co-developed with British scientist James Lovelock. The theory is based on the premise that the physical and chemical properties of EarthÂ’s atmosphere are actively regulated by the metabolism, growth and evolution of organisms.