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 Marijuana plants sit under grow lights at the 3D Cannabis Center in Denver. Retail pot shops open in Colorado â Sean Azzariti, an Iraq war veteran and marijuana activist, speaks to the media after becoming the first person to legally purchase recreational marijuana in Colorado.