Project Gutenberg, started in 1971, is the oldest part of the modern free culture movement. Wikipedia is a relative upstart, riding on the wave of success of free software, extending the idea to other kinds of information content. Today, Project Gutenberg, with over 24,000 e-texts, is probably larger than the legendary Library of Alexandria. Wikipedia is the largest and most comprehensive encyclopedic work ever created in the history of mankind. It's common to draw comparisons to Encyclopedia Britannica, but they are hardly comparable works—Wikipedia is dozens of times larger and covers many more subjects. Accuracy is a more debatable topic, but studies have suggested that Wikipedia is not as much less accurate than Britannica as one might naively suppose.