Many of us have heard about the terrible air quality in Beijing, China in a very abstract way. On January 10, 2012 the Earth Observatory, a NASA operated imaging satellite, captured images of a large cloud of smog that limited visibility to 200 meters. Smog clouds like this are more common in the winter, due to a phenomenon known as temperature inversion. (Essentially, during the...
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Revisit the memorable architectural and visual design of Chicago's 1933 World's Fair.
Tim Samuelson and Lisa M. Snyder present a virtual tour of the 1893 Columbian Exposition.
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