--We travel to Gaithersburg, Maryland, to learn about fire and evacuation research at the National Institute of Standards and Technology (NIST).
--We look at the role of cognitive systems in managing large crowds, such as the 2009 Inauguration of President Obama.
--We visit the North American Handmade Bicycle Show (NAHBS) in Richmond, Virginia.
--We meet a maker of bamboo bicycles.
--We meet a maker of titanium bicycles.
