Pot magazine High Times held its annual Cannabis Cup this past weekend in Denver.

The event coincided with the broader "4/20" celebration, which was marred to some extent by a shooting.

There's considerable effort put into the development of new, interesting, and potent strains of marijuana.

The industry is in a major period of innovation following legitimization last November after ballot initiatives in Colorado and Washington made marijuana legal.

That's why this event was one of the most important events, the first such Cannabis Cup in the post-legalization era.