Knuth himself wrote of his current work on Volume 4B that "There's stuff in here that isn't in Wikipedia yet!" :-) So it's not true that everything is in Wikip

Knuth himself wrote of his current work on Volume 4B that "There's stuff in here that isn't in Wikipedia yet!" :-) So it's not true that everything is in Wikipedia, but even more importantly, even if the raw facts are in Wikipedia, that doesn't mean it's expressed in the best possible way. I greatly enjoy reading Knuth's work; his writing style is delightful. Reading Wikipedia is often dry and lifeless.