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Jiro comments on The horrifying importance of domain knowledge - Less Wrong Discussion
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If I ask most programmer or people of other domains whether all months have more than 27 days I think most of them would say, of course all months have more than 27 days. That if wednesday is the second of a month the following friday out to be the 4th of the months.
You actually need to know about the strangeness of september 1752 to know that there this one month in the calender who had less days. It had no days between the 2nd and the 14th.
Children get taught in school that minutes have 60 seconds and not that there a body that decides 18 months in advance whether the minute is supposed to have 59, 60, 61 or 62 seconds.
This is no different from asking someone the fastest route to get to the store and being told "go a mile down that road and take a left" even though the person didn't check to see if the road was temporarily blocked. If you ask someone directions, they're probably not going to add "unless the road isn't temporarily blocked" and "unless a meteor hit the store last night and I didn't know about it yet" and "unless there's a quantum fluctuation that will move all your molecules right next to the store".
In many cases Google Maps has disclaimers like that.
In programming you usually do care more about edge cases then you care in daily life.