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.
Marijuana is sold like alcohol in Colorado, to those age 21 and older. Residents can buy up to an ounce, and out-of-staters can buy a quarter ounce. Colorado becomes the first state in the nation to open recreational pot stores. It's also the first in the world where pot will be regulated from seed to sale.