This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Szilard and Hilberry. Dr Norman Hilberry left and Dr Leo Szilard stand beside the site where the world's first nuclear reactor was built during World War II Both worked with the late Dr Enrico Fermi in achieving the first selfsustaining chain reaction in nuclear energy on December at Stagg Field University of Chicago undated doedigitalarchive