Photos: All wound up at yo-yo contest

Bill deBoisblanc, longtime yo-yo player and National Grand Master of the sport, was the head judge Saturday at the California State Yo-Yo Championships at San Francisco's Exploratorium science museum. Some 100 yo-yoers participated in an attempt to spin their way into the U.S. National Yo-Yo Contest, which takes place in October in Chico, Calif.

Caption text by James Martin of CNET News.com.

Photo by James Martin/CNET News.com