if you take Wikipedia as a kind of unit, all of Wikipedia, the whole project--every page, every edit, every talk page, every line of code, in every language that Wikipedia exists in--that represents something like the cumulation of 100 million hours of human thought.
This seems ridiculously low. That's an average of less than one minute per person worldwide.
I think I've spent about a minute contributing to Wikipedia - and I'm one of those rare humans with access to a computer and clean water.
EDIT: Wait, including talk pages... probably several minutes.
Here's the new thread for posting quotes, with the usual rules: