The Pu 239 pit of Fat Man was only 3.6 inches (9 cm) in diameter, the size of a softball.

See also List of newspaper columnists References Further reading External links Mike Royko Chicago Sun Times Royko in Love in Chicago Magazine , March 2009 Royko at The Goat video interview on 16 inch softball Collection of columns including Ex Cubs Factor Illinois History Mike Royko on Find A Grave Mike Royko Papers online inventory, Newberry Library, Chicago, Illinois Studs Terkel and Mike Royko at a Chicago Bar Full Video Even Earlier Royko O'Hare News columns from 1955