Danish seismologis Inge Lehmann was born at a time when there were few women working in the scientific field. Yet her insight, coupled with her rigorous observations of the way earthquakes moved through the Earth’s core, changed the scientific understanding of what’s at the center of the Earth. The Earth’s core is not a single ball of molten metal, Ms. Lehmann realized – instead, there’s a solid inner core surrounded by a roiling liquid outer core. http://www.csmonitor.com/Science/Sc...overed-the-truth-about-the-Earth-s-core-video
