 | McMillan recreating the search for neptunium at the time of the announcement of the discovery, June 8, 1940. |  | Glenn Seaborg adjusts a Geiger-Muller counter during search for plutonium at the Laboratory. |
| McMillan recreating the search for neptunium at the time of the announcement of the discovery, June 8, 1940. | | Glenn Seaborg adjusts a Geiger-Muller counter during search for plutonium at the Laboratory. |