Quote from : All the President's Men Book

Sussman had the ability to seize facts and lock them in his memory, where they remained poised for instants recall. More than any other editor at the Post, or Bernstein and Woodward, Sussman became a walking compendium of Watergate knowledge, a reference source to be summoned when even the library failed. On a deadline, he would pump these facts into a story in a constant infusion, working up a body of significant information to support what otherwise seemed like the weakest of revelations. In Sussman's mind, everything fitted. Watergate was a puzzle and he was a collector of the pieces. -- Carl Bernstein, Bob Woodward