Hanko de Mayo is the name given to Hank Green's birthday, so named because it falls on May 5th, the same day as the celebration Cinco de Mayo. Happy birthday Hank!!

Videos: 
2009: http://nerdfighteria.info/video/54/boL4yKf2IaQ/1

2010: http://nerdfighteria.info/video/54/OyJb2nzAZIk/1

2011: http://nerdfighteria.info/video/54/TmR6sXWnqvQ/1

2012: http://nerdfighteria.info/video/54/pW07xWczDr4/1