Math Limerick, Euler's Jewel

Found this little rhyme on a tweet from Colin Wright...  another source sites Mervyn Cripps, but not sure if he created it, or just sent it to the site...

I used to think math was no fun
 For I could not see how it was done
 Now Euler's my hero
For I see why zero
Is e to the i pi plus one

American physicist Richard Feynman (1918-1988) called the equation "Euler's Jewel" , and "the most remarkable formula in mathematics".  (The Feynman Lectures on Physics, vol. I, 1977)