4. The members of the band the Grateful Dead moved to the San Rafael area from San Francisco in 1970. They had connections to some of the parents of the Waldos, and eventually picked up the phrase and began using it.
5. The term spread past San Rafael with the help of the Grateful Dead and after a story about the Waldos appeared in "High Times." Another story in the magazine suggested that 4:20 was an "accepted" hour to use cannabis.
6. April 20 is observed around the country and around the world as a time to gather together to smoke pot. In places where it is illegal to sell it, it is often given away on that day.
7. Some believe that the number 420 refers to the anniversary of the deaths of Bob Marley or Jimi Hendrix. It does not. Neither died on April 20.
8. It is not a police code for someone smoking marijuana, either.
9. Snapchat may allow users to display a 420 graphic on Friday.
10. Ben & Jerry's Half Baked ice cream and Sour Patch Kids candy were the top two requested "munchies" delivered by goPuff in 2016. The on-demand delivery company saw an 80 percent increase in orders for food such as chips, cookies, candy and beef jerky on April 20, 2016, according to company officials.