#OTD in 1942, @UChicago scientists achieved the first controlled nuclear chain reaction. In Sept. our Chicago staff hosted one of the surviving members of the original team, Ted Petry w/ wife Adeline. [WATCH & READ] Mr. Petry's story: http://bit.ly/2i87Gjb #nuclear75pic.twitter.com/lMEVuD9lG0
7:45 AM - 2 Dec 2017
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