You can thank a bunch of California stoners in the 1970s
(Newser) -
Happy 4/20, hippies! In honor of marijuana's biggest day of the year, potheads nationwide will light up $4.20 joints, throw 4/20 concerts, hold 4/20 bake-offs, ring in 4:20pm—and some will even do it legally, now that the Man has horned in on the action—all in...