"Celebration of the Mind" Day -- October 21

     Established in honor of math-popularizer Martin Gardner (1914-2010), Celebration of the Mind Day occurs on October 21 each year.  Lots of interesting information about Gardner and the celebration-day may be found at this link.      This link leads to previous postings in this blog that feature Gardner and his work.   Not a poet, Gardner called himself "an occasional versifier" and here is an example:

          π goes on and on
          And e is just as cursed
          I wonder, how does π begin
          When its digits are reversed?    

For an array of mathy connections that celebrate the mind and stretch it, explore the links offered above!