Ted Petry, last surviving witness to first self-sustaining nuclear chain reaction, dies at 94
<p>Ted Petry, last surviving witness of successful Chicago Pile-1 reaction, dies</p>

Ted Petry dies; last known witness to historic 1942 U. of C. nuclear reaction
<p>Ted Petry, last living witness of first nuclear chain reaction at UChicago, dies</p>

Chain reaction that started the Atomic Age
<p>UChicago community commemorates 75th anniversary of first nuclear reaction</p>
UChicago