When a tunnel collapses or a mudslide occurs, what has really happened beneath the earth's surface? How do human activities such as mining, construction, and agriculture interact with soil structure? And how can nature's engineers--such as ants--help humans become more effective manipulators of the earth? James Hambleton, a professor of civil and environmental engineering at Northwestern University, will speak on "When the Earth Gives Way, for Better or Worse." Sponsored by the Friends of the Glencoe Public Library.