Speaker Name(s): Dr. Christopher P. McKay-Moderator, Dr. Steven A. Benner, Professor Stuart A. Kauffman, Professor Antonio Lazcano, Professor Robert Shapiro Description: How do scientists explain the emergence of life four billion years ago? The simple answer is they can't -- just yet. On October 4, McGill will host the third annual Lorne Trottier Public Science Symposium: "Origin of Life: What Waas the Spark of Life?" during which four of the world's foremost experts on the chemical and biological origins of human existence will grapple with the question that humankind has contemplated for centuries. The expert lineup includes Dr. Stuart A. Kauffman, a theoretical biologist from the University of Calgary; Dr. Antonio Lazcano, a biologist and president of the International Society for the Study of the Origin of Life; and Dr. Robert Shapiro, an organic and bio-organic chemist from New York University. Dr. Christopher P. McKay, a planetary scientist with the Space Science Division of NASA Ames Research Center, will moderate the debate. This year's symposium, hosted by the Department of Earth & Planetary Sciences, will be held in Leacock 132 from 5 to 7 p.m. Admission is free and all are welcome.