Eyyyyyyyyyyyyyyy happy 420, losers! It's pretty much guaranteed that you've never taken the time to appreciate the physical beauty of good old Mary Jane, but with Green: A Field Guide to Marijuana ($26, Amazon), you can, JUST IN TIME FOR 420. Featuring gorgeous, detailed photos and background information on 170 strains, this is the definitive collection of cannabis. Put it on your coffee table and let everyone know that you're never not down to blaze. Just put it away when your in-laws visit.