Thomas comments on Procedural Knowledge Gaps - Less Wrong
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AFAIK many use this technique. I have an instant knowledge about the number of days for every month. Once I thought almost everybody has it, but apparently it is not the case.
I have an instant knowledge about the number of days for some months; for the others I use the knuckle mnemonic (sped up by the fact that I remember that the two consecutive 31-day months corresponding to the index fingers are July and August.) I don't even have to actually close fists anymore, I just do it in my mind now.