I did a work at University about 500 years ago.

We started with a brand new OS (Unix based) that actually would learn from the user.
When you started you would get lot of help, but when you learned the new OS the help decreased and the system got faster. The OS would also know your habits, did you usally do that a Tuesday, or did you take lunch at the same time every day, did you go home early on Fridays.
We never completed the work... but it was fun!
(Note: The real danger was that the OS in the end could behave like a girlfriend / wife)


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