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Why did you spend hours digging into something you already knew the answer to?



They didn't know it any longer. They are using StackOverflow as a second brain, offloading knowledge to it.


Pensieve.


Because "knew" is past tense. There are a lot of things that I once "knew" but no longer "know", and it's nice when that past knowledge is documented somewhere.


Solving a problem once doesn't guarantee it's added to your knowledge. Learning needs repetition, if you solve that problem once a year, you'll learn it very slowly.


Not OP, but... more often than I care to admit, past me is perfectly aware of the answer to this problem, but present me has long since forgotten.


Knowing something at some point in the past does not mean you currently remember it!




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