In the June 15 "Human Nature" item on captchas (Completely Automated Public Turing Test To Tell Computers and Humans Apart), William Saletan originally said that test images had become so hard to decipher that a company's chief technology officer flunked 75 percent of them. The source article actually said that the CTO passed 75 percent of the tests, which were administered by Ticketmaster. This mistranslation inadvertently illustrates the article's point: the limits of human intelligence. Link