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.
Retail pot shops open in Colorado â Customers wait in a long line for their turn to buy recreational marijuana outside the LoDo Wellness Center on Wednesday, January 1, in Denver. Colorado is the first state in the nation to allow retail pot shops.