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pi day? How about e day? Just as useful, one one-hundredth the popular recognition.
Only a woos needs a mnemonic device to remember pi. I know the first 50 digits by heart and can recite them in less than 8 seconds.
True story:I was learning pi at the rate of a digit a day, from a book in the library when I was in high school (the book had it written out to a thousand digits). I'd gotten to sixty digits. But I made a mistake. I showed it to a friend of mine who was a burgeoning capitalist, and he checked out the book and offered to sell it to me for a nickel a digit. Refusing to submit to such classless blackmail, that was the end of my memorizing pi.It was such an 'irrational' thing to do, anyway.
The one I was told in high school algebra (about an eternity ago) was "See, I have a rhyme assisting, my feeble brain its tasks resisting," although it only provides 12 digits instead of 15. I then memorized 13, rendering the mnemonic redundant, but still pointlessly memorable. And I say memorizing more than 13 digits of pi is just overkill.
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