Grinders are on display for sale during the HempCon 2011 Medical Marijuana Expo at the Los Angeles Convention Center on August 26, 2011 in Los Angeles, California. The three-day event includes exhibits, evaluation services, legal services, equipment, and accessories. (Photo by Kevork Djansezian/Getty Images)

A worker prepares the “Cutter Head” of the Port Tunnel boring machine for attachment to the tunneling machine on September 1, 2011 in Miami, Florida. The $45 million machine is longer than a football field and about as tall as a four-story building and it will carve the twin tunnels connecting Watson Island and Dodge Island. The the new $1 billion Port of Miami tunnel is expected to be completed in May of 2014. (Photo by Joe Raedle/Getty Images)

A body surfer rides a high wave at the Wedge on September 1, 2011 in Newport Beach, California. Waves measuring up to 20 feet pounded the beach. A winter storm off the coast of Australia and New Zealand brought unusally hgh serve to the Southern California beaches. (Photo by Kevork Djansezian/Getty Images)

Meri Nirmala Sari, 11, poses in her traditional costume before a performance August 6, 2002 in Ubud, Bali, Indonesia. Meri dances with the Gunung Sari Peliatan dance group and has become a professional. She started dancing at age 5. (Photo by Paula Bronstein/Getty Images)

A red deer stag watches from the cover of a bracken thicket during the autumn rutting season at Richmond Park on October 10, 2011 in London, England. Autumn sees the start of the “Rutting” season where the stags and bucks bellow in an attempt to attract female does and hinds. (Photo by Dan Istitene/Getty Images)

A Research In Motion BlackBerry device is shown on October 12, 2011 in Chicago, Illinois. A three-day disruption of service that has previously affected users in Europe, the Middle East, Africa and India has now spread to customers in North America. Customers are experiencing patchy email service and receiving no access to browsing or messaging. (Photo Illustration by Scott Olson/Getty Images)

Shrine Parishioners pull their portable shrine during Nada No Kenka Matsuri, or Nada Fight Festival at Matsubara Hachiman Shrine on October 16, 2011 in Himeji, Hyogo, Japan. The fight, the highlight of the shrine's Autumn Harvest Festival, attracts 100,000 people. (Photo by Buddhika Weerasinghe/Getty Images)

Dr. Hannah Cobb from The University of Manchester looks at a viking sword during a viewing at CFA Archaeology of artefacts discovered from the first fully intact Viking boat burial site on October 18, 2011 in Edinburgh, Scotland. (Photo by Jeff J Mitchell/Getty Images)