" Then everyone began to wonder why he didn’t shut the pile off,” Anderson continues. 1701 “But Fermi was completely calm. He waited another minute, then another, and then when it seemed that the anxiety was too much to bear, he ordered ‘ZIP in!’ ” It was 3: 53 P.M. Fermi had run the pile for 4.5 minutes at one-half watt and brought to fruition all the years of discovery and experiment. Men had controlled the release of energy from the atomic nucleus. "

― Richard Rhodes , The Making of the Atomic Bomb