Featured image: 7,000-year-old skeleton of woman may have been a victim of leukemia, making it the oldest case found.
Story highlights. Colorado began allowing the sale of recreational marijuana on January 1 to anyone age 21 or older. Residents can now buy marijuana like alcohol -- except the cannabis purchase is limited to an ounce, which is substantial enough to cost about $200 or more.
That's a lot of green for Colorado's legal weed. Colorado, the first state to allow retail recreational marijuana sales to adults age 21 and older, has projected nearly $600 million in combined wholesale and retail marijuana sales annually.