The nerds get their revenge in Tokyo's new Cool CentralHere in Akihabara it is more than O.K. to be a Nerd. In fact, it is cool. So cool there are entire floors of stores filled with miniature cartoon figures and collectibles to tempt a geek's, or an otaku's, obsession.Since World War II, Akihabara, in northeastern Tokyo, has been an electronics extravaganza featuring everything from diodes to