Wikipedia – an unplanned miracle | Clay Shirky | Comment is free | The Guardian

"The cumulative effort of Wikipedia's millions of contributors means you are a click away from figuring out what a myocardial infarction is, or the cause of the Agacher Strip war, or who Spangles Muldoon was. This is an unplanned miracle, like "the market" deciding how much bread goes in the store. Wikipedia, though, is even odder than the market: not only is all that material contributed for free, it is available to you free; even the servers and system administrators are funded through donations. That it would become such a miracle was not obvious at its inception and so, on the occasion of its 10th birthday, it's worth retelling the improbable story of its genesis...."