It was well established in TOS that Spock was a virtual encyclopedia of scientific, historical, and cultural information, who essentially remembered every fact he had ever learned. After his katra was put back in in STIII, did he still remember all of this stuff, or did he need to be reeducated on everything? I was always under the impression that he still retained all of his memories, but he brain required serious "defragging" for lack of a better term. What does everybody else think?