The Adler Planitarium was the first planetarium in America, founded in 1930 by Chicago businessman Max Adler.
April 17 at 8:36 PM
The world's first successful open heart surgery was performed in Chicago in 1893 by Daniel Hale Williams, one of the first black cardiologists in the country.
March 26 at 7:58 PM
In exceptionally hot weather, Chicago's bridges can expand to the point that they cannot close.
January 31 at 9:17 PM
Chicago scientist W.D. McNally had a hand in creating the breathalyzer in 1927.
January 5 at 8:47 PM
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