Many years ago I was coding the UI for one of the first touchscreen check-in systems at an airline. The guy in the next cube was doing weight and balance softw

Many years ago I was coding the UI for one of the first touchscreen check-in systems at an airline. The guy in the next cube was doing weight and balance software for the actual flights. I realized that I could not handle the pressure of thinking that a bug in my code could lead to a crash, no matter how remote the chances actually were. I'm sure that some of you work on code where lives are at stake, how do you deal with the possibility of truly fatal bugs?