IDG World Expo today announced the MacBrainiac Challenge, an all-new game show-style contest, taking place at Macworld Expo San Francisco from January 7-10, 2003. All Macworld Conference & Expo attendees are invited to attend as two teams of Mac personalities are pitted against one another in a quick-witted trivia contest. The MacBrainiac Challenge takes place on Thursday, January 9 from 12:30-1:15 p.m and will be hosted by best-selling author David Pogue.