Lipids or RNA world?

The Woodstock of Evolution -- The World Summit on Evolution (ScientificAmerican.com): University of Massachusetts theoretical biologist Lynn Margulis, asked Antonio Lazcano, President of the International Society for the Study of the Origins of Life, 'In your opinion what came first, cells or the RNA world?' Lazcano answered: 'If you define a cell as a membrane-enclosed system, then lipids-enclosed systems assisted in the polymerization of molecules, which led to RNA. Lipids and cells came first, then the RNA world.'"