Poderia ser Relatório sobre o "Grand Central Terminal" de Leo Szilard? O artigo apareceu em The University of Chicago Magazine em 1952. Ele descreve os banheiros pagos na Grand Central Station:
Another point, however, was much harder to understand. This problem arose because we found that the door of each and every cubicle in the depository was locked by a rather complicated gadget. Upon investigation of these gadgets it was found that they contained a number of round metal disks. By now we know that these ingenious gadgets barred entrance to the cubicle until an additional disk was introduced into them through a slot; at that very moment the door became unlocked, permitting access to the cubicle.
Segue especulando sobre o significado dos "discos" e as razões para trancar as portas.