The ideal authentication system demands that you provide your identity exactly once. The bigger the system the harder to maintain this.
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A cute systemd feature to get the system clock roughly correct: if the system time is before the compilation time of the systemd binary, it moves the clock forward to that time!
https://lwn.net/Articles/714355/
TIL Drupal has a credit system to give preferential treatment to people and organisations who contribute regularly! https://dri.es/solving-the-maker-taker-problem
Today I learnt that the original name for DOS was QDOS, for "Quick and Dirty Operating System"! https://en.wikipedia.org/wiki/DOS#QDOS
(Seems rather unfortunate that they dropped the Q.)