Time to Kill Off Captchas; March 2012; Scientific American Magazine; by David Pogue; 1 Page(s)

Whenever there’s a problem in the modern world, we try to solve it by building barriers. Music piracy? Copy protection. Hacked Web sites? More complicated passwords.

Unfortunately, these barriers generally inconvenience the law-abiding citizen and do very little to impede the bad guys. Serious music pirates and Web hackers still find their way through.