Again, the riddle:
What is (mathematically) interesting about the following poem:
"Sir, I bear a rhyme excelling
In mystic force, and magic spelling
Celestial sprites elucidate
All my own striving can't relate."
Answer: It's a pi-mnemonic, with each the number of letters in each word representing a digit of pi.
Source: Professor Stewart's Cabinet of Mathematical Curiosities by Ian Stewart
