system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:How do designers keep aircraft flight controls from getting the blue screen of death or crashing while mid air?
gpt
There are a few major ways to keep mission critical electronics from crashing:

* Be so simple that even if you do crash you can recover near instantly - *The computers on the Apollo spacecraft could reboot in a fraction of a second*

* Have non-identical backups for your main system - *The space shuttle had control systems that were constructed in different ways so if one went bad, the same error wouldn't affect the other*

* Put it to a vote - *SpaceX uses three computers that are running in parallel, and if the output of any one system isn't identical, recognizes the error and reboots the faulty system.*