- If you use Google Satellite View to look at airbases that used to be used by Strategic Air Command back in the Cold War, you can spot the area known as a "Christmas Tree" where the Ready Alert bombers stood parked, prepared to do nuclear combat toe-to-toe with the Russkies. Look around the Christmas Tree, and you'll find the Mole Hole.
- While Colt has been selling 9mm 1911-pattern pistols since cars had tail fins (the 9mm Colt Commander debuted in 1950, IIRC), they were all single-stacks. It wasn't until Szabo and Polyzos at Para-Ordnance came up with the wide-body frame that you could get a double-stack with a Government Model slide assembly and lockwork. In fact, the earliest Paras were sold as frame kits; you were expected to use the slide and most of the lockwork from your own Colt. Jeremiah Knapp at American Rifleman wrote a good explainer on the difference between wide-body 1911s, the later chassis-style 2011 by Strayer and Tripp, and the latest Wilson X-style guns.
- Back in the days of the Model T, a lot of paved state highways were one-lane. Oncoming cars would have to put two wheels off the pavement to get past each other. As vehicle speeds and traffic volume increased, something needed to be done to fix that situation.
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