Luis von Ahn is conducting a virtual "barn raising" to get free labor from you! Every time you type in one of those CAPTCHAs, the wiggly words used to authenticate you when you sign on to a site, you may be correcting a piece of digitized text. The CAPTCHAs are a type of Turing test. Luis von Ahn won a MacArthur genius award for
his idea. Thanks to him, we may have ever more eBooks!