I removed the rubhub.com link because that site is dead.

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I deleted the reference to all sub pages generating "Not Found" errors. Maybe they were just having server troubles that day, because all these links look fine to me. And besides, that note was four years old.

I also swapped out the link to Ryerson because that link is dead, and the content is not to be found on the Ryerson site. The new link is to the original article still on the Scientific American site, but you have to subscribe to read it. Maybe a direct appeal from Matt Mullenweg will get permission to post a copy here on the Codex? ;-). Then I added a link to a follow up article which has no subscription restrictions.

I also re-edited my own changes to make them flow better with the original text.

Natcolley 01:49, 23 September 2013 (UTC)