Recaptcha

This is an inspired effort to put otherwise wasted time to good use. Recaptcha, which we'll be adding to this site as soon as we get two free seconds (besides the ones we're using right now), trades the codes entered for comment, Ticketmaster, and other verification schemes for tiny snippets of text. Instead of the usual gobbledygook, the text you enter is part of the global effort to digitize all books. It's sort of a human-powered SETI project.