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Two Hard Things (2009)
There are only two hard things in Computer Science: cache invalidation and naming things -- Phil Karlton (bonus variations on the page)
Long a favorite saying of mine, one for which I couldn't find a satisfactory URL. There are 2 hard problems in computer science: cache invalidation, naming things, and off-by-1 errors. 2017-03-30: added proper tweet for off-by-one and mention of Tim Bray's source
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