Before revision: In a 1999 publication, Engelbart recollects that reading "As We May Think" in 1945 infected him with the idea of building a mechanism that could navigate and extend the pool of human knowledge .
After revision: In a 1999 publication, Engelbart recollects that reading "As We May Think" in 1945 he "became 'infected' with the idea of building a means to extend and navigate this great" pool of human knowledge .