Anyone who has ever picked up a copy of Darwin's The Origin Of Species or The Descent Of Man would probably be surprised to learn that such weighty tomes are, in fact, merely abstracts from a far greater body of work.
Darwin was a prolific writer, and each of his most famous books is backed by literally thousands of pages of meticulous research.
Well, a group at the University of Cambridge, Darwin's old school, has started a mammoth project to put all of that research online.
The Complete Works of Charles Darwin currently has over 50,000 pages of text and over 40,000 pictures and illustrations.
Dr John van Whye, who is heading the project, says that he hopes to double those figures by 2009, in time for the bicentennial of Darwin's birth and the 150th anniversary of the publication of The Origin Of Species.