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.
A man smokes a joint during the official opening night of Club 64, a marijuana social club in Denver, on New Year's Eve 2012. Voters in Colorado and Washington state passed referendums to legalize recreational marijuana on November 6, 2012.