Zero the Hero

Have you heard of Zero the Hero?  I first learned of Zero last year.  He is a superhero that comes to visit my classes every ten days beginning with the 10th day of school and ending on the 100th day of school.  He leaves a note and a treat shaped like a zero.  He brings the message of the importance of the number 0.
This year I found a PDF book about how Zero became a hero.  Here is the link.  There is a song by Dr. Jean , Number Stomp, that we sing and dance to.  Here is the link to the words for the song.