Question

All of the following sentences from “Enrico Fermi: The ‘Italian Navigator’” are facts except one. Which one is it?



“At last, at 3:25, the final order was given.”


“The control rods were made of cadmium.”


“At last the day came when the pile was ready to be tested. It was December 2, 1942.”


“But he stepped out briskly, breathing deeply of the cold air.”