My favorite story about the Manhattan Project librarian is the gold sphere. One research experiment required a 6 inch gold sphere and another a 10 inch platinum

My favorite story about the Manhattan Project librarian is the gold sphere. One research experiment required a 6 inch gold sphere and another a 10 inch platinum disk. Since the library vault was the more secure place, these packages were sent to the library. Charlotte (the librarian) amused herself by asking people if they could move the little packages for her. The would-be assistant was surprised that he couldn't move the packages: the gold sphere weighed 80 pounds and the platinum disk 60. (From the Los Alamos Primer, page 30)