What 420 Means: The True Story Behind Stoners' Favorite Number | Huffington Post 

Several stoners, including Warren Haynes of the Allman Brothers Band & The Grateful Dead, help Ryan Grim of The Huffington Post track down the origin of 420. Posted April 2009.
Keywords: marijuana, weed, 420, origin, huffington post, article, ryan grim, april 2009