When an app quits unexpectedly, it's called a 'crash' with a .crash file extension. The information about what the app was doing right before the crash is sent to the developer to investigate the cause of this crash so they can update their app. It works the same way for the iPhone.
(When an app crashes, the iPad just quits the app and takes you to the home screen. It's not like you see a blue screen or anything)
It looks like the USA today app crashed unexpectedly. No developer can make 100% perfect code. Apps crash all the time. The iPad just makes the experience more pleasant.