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 could be legal across Colorado within two months, according to a spokesman for the governor's office. The 536 medical marijuana dispensaries in Colorado could begin selling to the general public then, according to University of Denver law professor Sam Kamin.